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Anonymous users2024-02-10One. 1 The sum of two numbers that are opposite to each other is (0 ); The product of two numbers that are reciprocal to each other is (1).
2 If the absolute value of a number is 2, then the number is (plus or minus 2).
3 The two points a and b on the number axis are respectively represented by -3 and 1, then the distance between a and b is (4).
4 If the product of four unequal integers is equal to 9, then the sum of the absolute values of these four integers is (8).
5 Write 5 rational numbers (three of which are fractions) with a product of -1. 1，-1）（，2） （5）
6 The approximate number taken by rounding (with two significant figures retained) is ( ).
7 is greater than - and there are (4) integers that are less than.
8 Fill in the following rational numbers in the corresponding set:
3 and 1 2 ,0,,+12,3 and 1 2,|-5|，-4，-（1/3）。
ps:- 3 and 1 2 = minus three and a half].
Integer set: Negative integer set:
Fraction Collection: Negative Numbers Collection:
9, put the number - 3 and 1 2, 0, 1 2, 3, from small to large: (3 and 1 2<<0<1 2<3).
10 Calculations. [To write the calculation process].
1) 9 and 1 2 x 1 and 3 4 19) + 19:
19 and 7 8
11.Columnar calculations:
A number smaller than the opposite of -2 by 5: the difference between the square of -2 and the product of -2 and -4:
12.A fruit shop buys 10 baskets of apples from the orchard, each basket is 50 kg as the standard, more than the standard is recorded as positive, and less than the standard is recorded as negative
1) Q: How many kilograms of apples does the fruit store buy?
1+ kg.
50+ kg.
2) The price tag of the fruit store says that the unit price of apples is 4 yuan kg, *** yuan kg, if the purchase price of apples in the fruit store is 2 yuan kg, then the fruit store will make a total profit when all the apples purchased are sold out.
How much is it? Kilogram.
13）.Year 7 students play a game of checkers, the rules of the game are: first draw a number line, the flag falls on the number line K0, the first step jumps from point k0 to the left to the point K1, the second step jumps from point k1 to the right 2 unit length to point K2, the third step jumps from point k2, jumps three unit length to the left to point K3, the fourth step jumps from point k3 to the right 4 unit length to point K4....
After jumping 20 steps like this, the flag falls to the point k20 on the number lineIf the number represented by the point k20 is 18, what is the number represented by the question point k0? [Write about how the result was obtained, the process.
From the title, k0-1+2-3+4 -......19+20=18
k0-1+2-3+4-……19+20
k0+2-1+4-3+……20-19
k0+1+……1
k0+10=18
Get k0=8
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Anonymous users2024-02-09It should be: one.
1 The sum of two numbers that are opposite to each other is (0 ); The product of two numbers that are reciprocal to each other is (1).
2 If the absolute value of a number is 2, then the number is (plus or minus 2).
3 The two points a and b on the number axis are respectively represented by -3 and 1, then the distance between a and b is (4).
4 If the product of four unequal integers is equal to 9, then the sum of the absolute values of these four integers is (8).
5 Write 5 rational numbers (three of which are fractions) with a product of -1. 1，-1）（，2） （5）
6 The approximate number taken by rounding (with two significant figures retained) is ( ).
7 is greater than - and there are (4) integers that are less than.
8 Fill in the following rational numbers in the corresponding set:
3 and 1 2 ,0,,+12,3 and 1 2,|-5|，-4，-（1/3）。
ps:- 3 and 1 2 = minus three and a half].
Integer set: Negative integer set:
Fraction Collection: Negative Numbers Collection:
9, put the number - 3 and 1 2, 0, 1 2, 3, from small to large: (3 and 1 2<<0<1 2<3).
10 Calculations. [To write the calculation process].
1) 9 and 1 2 x 1 and 3 4 19) + 19:
19 and 7 8
11.Columnar calculations:
A number smaller than the opposite of -2 by 5: the difference between the square of -2 and the product of -2 and -4:
12.A fruit shop buys 10 baskets of apples from the orchard, each basket is 50 kg as the standard, more than the standard is recorded as positive, and less than the standard is recorded as negative
1) Q: How many kilograms of apples does the fruit store buy?
1+ kg.
50+ kg.
2) The price tag of the fruit store says that the unit price of apples is 4 yuan kg, *** yuan kg, if the purchase price of apples in the fruit store is 2 yuan kg, then the fruit store will make a total profit when all the apples purchased are sold out.
How much is it? Kilogram.
13）.Year 7 students play a game of checkers, the rules of the game are: first draw a number line, the flag falls on the number line K0, the first step jumps from point k0 to the left to the point K1, the second step jumps from point k1 to the right 2 unit length to point K2, the third step jumps from point k2, jumps three unit length to the left to point K3, the fourth step jumps from point k3 to the right 4 unit length to point K4....
After jumping 20 steps like this, the flag falls to the point k20 on the number lineIf the number represented by the point k20 is 18, what is the number represented by the question point k0? [Write about how the result was obtained, the process.
From the title, k0-1+2-3+4 -......19+20=18
k0-1+2-3+4-……19+20
k0+2-1+4-3+……20-19
k0+1+……1
k0+10=18
Pick me, choose me.
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Anonymous users2024-02-086.Cube.
Piece. 8.Integer: 0, +12, 1-51, -4 Negative integer: -4 Fraction: - 3 and 1 2 ,, 3 and 1 2, -(1 3) Negative: -3 and 1 2,,-4
9.- 3 and 1 2 , too much, can only write about this, sorry
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Anonymous users2024-02-078.Integer Collection:
Negative integer collection:
Fraction Collection: Negative Numbers Collection:
9.-3 again 1 2 0 3
10.9 and 1 2 x 1 and 3 4 19) + 1918 and 1 8
11.A number that is 5 smaller than the opposite of -2.
The difference between the square of 2 and the product of -2 and -4.
12.A fruit shop buys 10 baskets of apples from the orchard, each basket is 50 kg as the standard, more than the standard is recorded as positive, and less than the standard is recorded as negative
1) Q: How many kilograms of apples does the fruit store buy?
2) The price tag of the fruit store says that the unit price of apples is 4 yuan kg, *** yuan kg, if the purchase price of apples in the fruit store is 2 yuan kg, then the fruit store will make a total profit when all the apples purchased are sold out. How much is it?
13）.Year 7 students play a game of checkers, the rules of the game are: first draw a number line, the flag falls on the number line K0, the first step jumps from point k0 to the left to the point K1, the second step jumps from point k1 to the right 2 unit length to point K2, the third step jumps from point k2, jumps three unit length to the left to point K3, the fourth step jumps from point k3 to the right 4 unit length to point K4....
After jumping 20 steps like this, the flag falls to the point k20 on the number lineIf the number represented by the point k20 is 18, what is the number represented by the question point k0? [Write about how the result was obtained, the process.
k0-1+2-3+4-……19+20=18
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Anonymous users2024-02-06or -28Integer Collection:
Negative integer collection:
Fraction Collection: Negative Numbers Collection:
9.- 3 1 2 < 0 < 1 2 < 3109 and 1 2 x 1 and 3 4 19) + 1911Columnar calculations:
A number that is 5 smaller than the opposite of -2.
The difference between the square of 2 and the product of -2 and -4.
12.A fruit shop buys 10 baskets of apples from the orchard, each basket is 50 kg as the standard, more than the standard is recorded as positive, and less than the standard is recorded as negative
1) Q: How many kilograms of apples does the fruit store buy?
2) The price tag of the fruit store says that the unit price of apples is 4 yuan kg, *** yuan kg, if the purchase price of apples in the fruit store is 2 yuan kg, then the fruit store will make a total profit when all the apples purchased are sold out. How much is it?
13）.Year 7 students play a game of checkers, the rules of the game are: first draw a number line, the flag falls on the number line K0, the first step jumps from point k0 to the left to the point K1, the second step jumps from point k1 to the right 2 unit length to point K2, the third step jumps from point k2, jumps three unit length to the left to point K3, the fourth step jumps from point k3 to the right 4 unit length to point K4....
After jumping 20 steps like this, the flag falls to the point k20 on the number lineIf the number represented by the point k20 is 18, what is the number represented by the question point k0?
Jump 1 unit to the right every 2 steps.
There are 20 2 = 10 two-step.
Jump 10 units to the right.
k0 means 8
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Anonymous users2024-02-05a,0 ; 1
Two, 2 or -2
Three, |1-（-3）|=4
Fourth, suppose the four numbers are -3, -1, 1, 3. So the absolute value of sum is 0
Five, suppose the five numbers are 1 2, 1 3, 1 4, -1, 24.
Sixth, the so-called significant number refers to counting from the first non-zero number on the left. So the answer is that x 10 3 are two significant figures and 10 3 is scientific notation.
VII,-2-1,0,1 for a total of four.
Eight, integer sets:
Negative integer collection:
Fraction Collection: Negative Numbers Collection:
Nine, in descending order: - 3 and 1 2,,0,1 2,3
Ten, (1) 9 and 1 2 x 1 and 3 4 19) + 19 = 19 2x7 4 (-19) + 19 = -1 2x7 4 + 19 = -7 2 + 19 = 15 and 1 2
2）25 ÷ 5） ÷1/5 ）=-5÷（1/5 ）=-5x5=-25
Eleven, -2 inverse: 2, 2-5=-3 less than 2 by 5
The difference between the square of 2 and the product of -2 and -4 = (-2) 2-[-2x(-4)]=4-8=-4
Twelve, (1) 50x10+1+
2) The real selling ** is yuan per kilogram, so the net profit per kilogram is, so the total profit is.
3) Take k0 as the marker, make a perpendicular line on the logarithmic axis, and find that the step points on the left side of k0 are all odd numbers 1, 3, 5 ,..The step points on the right are all even, 2, 4, 6....
And the length of the left step point kx from k0 is (x+1) 2, and the length of the right step point ky from k0 is (y 2), so the length of k20 from k0 is 20 2=10, and k20 is marked as 18, then k0 should be marked as 18-10=8
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Anonymous users2024-02-041. All assumptions are that A is x vehicles and B is (x+1) vehicles According to the title, 45x+60(x+1)=270 can be obtained, and x=2 y=3 freight=
350 * 2 + 400 * 3 = 1900 yuan.
Prompt him that B has 1 more car than A, and the number of computers = 270 It is not difficult to come up with the formula 45x+60(x+1)=270 As for A B, it has been calculated The freight is the sum of all the cars cost by A B, I hope I can understand.
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Anonymous users2024-02-03There are too many conditions to give, and in the end, it is a junior high school question - -0 I'm afraid you won't be able to do the inequality group 45x+60y 270
350x+400y≤2000
where x is the type A car used, Y is the type B car, and there is y=x+1 to get x 2 y 3
It can be seen that if you want to save 2 A3 B
The shipping cost is 350*2+400*3=1900
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Anonymous users2024-02-02Set up A type X set B type Y set freight w yuan.
A alone is 270 45 = 6 units Cost WA=6*350=2100 yuan.
B alone is 270 60 = = 5 units Cost wb = 5 * 400 = 2000 yuan.
is made up of a group of known available inequalities.
y-x=145x+60y>=270
w=350x +400y<=2000
The solution is 2<=x<= so x=2
Therefore, 2 types of A cars and 3 sets of type B cars have a freight of w = 1900 yuan.
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Anonymous users2024-02-01Solution: If you use X cars of type A, then X + 1 cars of type B.
Type A only: (270 45) 350 = 2100 Type B only: 270 60 = so 5 cars are needed 5 400 = 2000A B uses 45x+60 (x+1) 270350x+400 (x+1) 2000
Settle for yourself.
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What version of the textbook is it?