Urgent first year fill in the blank math problems

If there are 4 students in a class, 20 students will not live in the dormitory. If there are 8 people in each room, there is a room that is not full, try to find out the number of rooms and the number of residents in the dormitory?

2.Xiaobao and his father and mother were playing seesaw on the playground, the father weighed 72 kilograms and sat at one end of the seesaw, and Xiaobao, who weighed only half of his mother, sat on the other end of the seesaw with his mother, at this time, Dad's feet were still on the ground. Later, Xiaobao borrowed a pair of dumbbells with a mass of 6 kilograms and added them to the end where he and his mother were sitting, and as a result, Xiaobao and his mother's feet hit the ground.

Guess how many kilograms does Xiaobao weigh? (accurate to 1 kg).

3.It is known that a factory has two kinds of fabrics of 70 meters and 52 meters. It is planned to use these two fabrics to produce a total of 80 sets of fashion models A and B, and it is known that the fabrics required to make a set of A and B models of fashion are shown in the table below.

If so, how many production options are available? Please design it.

70 m 52 m.

a m. m.

b m. m.

4.If a number of cars with a load capacity of seven tons are used to transport a batch of goods, if each car contains only 4 tons, there are 10 tons of cargo left, and if each car is full of 7 tons, the last car is not empty. Excuse me: How many cars are there?

5.It is known that Limin Garment Factory has 70 meters of A fabrics and 52 meters of B fabrics, and now plans to use these two fabrics to produce a total of 80 sets of M and N two types of fashion, and it is known that a set of M model fashion needs 0 6 meters of A fabric and 0 9 meters of B fabric; To make a set of N model fashion, you need 1 1 meters of fabric A and 0 4 meters of fabric of B fabric; If the number of fashion sets for producing n models is x, there are several options for producing these two models of fashion with this batch of fabrics.

Answer. Solution: There are x rooms, Y people.

Then there is 4x+20=y....1

8x-872

From the above two formulas, we can get 22, so x=23

Solution: Set A product X set, B product set.

then there is x+y=80

With the above three formulas, we get 36<=x<=40

So x=36,37,38,39,40

So the task can be completed x=36,y=44; x=37,y=43;x=38,y=42;x=39,y=41;x=40,y=40;

Solution: There are x cars, y tons of goods.

then there is 4x+10=y

7x-7 has the above two formulas: 10 3<=x<=17 3

So x=4,5

So there are four or five cars.

Solution: Set M fashion x set, N fashion Y set.

then there is x+y=80

With the above three formulas, we get 36<=x<=40

So x=36,37,38,39,40

So x=36, y=44; x=37,y=43;x=38,y=42;x=39,y=41;x=40,y=40;

You're dreaming, two or three are pretty much the same.

More than 200, less than 300, is a common multiple of 2, 3, 5, can you name a few?

Actually, I don't quite understand what the landlord wants?

1.If the number corresponding to the point a on the number line is , then the rational number corresponding to the point 3 units of length away from the point a is ( or ).

2.If |x-2|If the square of (y+3) is the opposite of each other, then the xth power of y is equal to (9).

(1) or.

3 units long apart, so |x-（

So x=or.

x-2|The square of (y+3) is the opposite of each other.

then |x-2|+（y+3）^2=0

The sum of the non-negative numbers is 0

So |x-2|=0 and (y+3) 2=0

So x=2, y=-3

So (-3) 2=9

(1) A point that represents a number on the number line, and the distance it is from the origin is the number of this number: Absolute value (2) Rational numbers with absolute values of the same positive number are: 2.

3) A number is 10 smaller than its absolute value, and this number is: 5 (minus 5) (4) The relationship between the absolute value of the opposite of a number and the opposite of the absolute value of this number is: opposite to each other.

5) If the absolute value of a number is the opposite of the reciprocal of the number, then the number is: 1 (minus 1).

Question 1, Absolute Value Question 2, 2 (i.e. positive and negative numbers, e.g. -2, 2) Question 3, -5 (-5+10=5, 5 is -5 absolute value).

Fourth, the opposite number of each other (for example, the opposite number of 5 is -5, the absolute value of -5 is 5, the absolute value of 5 is 5, the opposite number is -5, and the relationship between -5 and 5 is the opposite number) Question 5, -1 (the absolute value of -1 is 1, the reciprocal of -1 is still -1, -1 and 1 are the opposite number) I don't know if you understand, I hope to adopt!

1. According to the definition of absolute value: the point that represents a number on the number line, and the distance it leaves the origin point is the absolute value of the number.

So the answer is: absolute.

1;Absolute value.

2: Myriad. 3: minus 5

4: 5:1 is the opposite of each other

The algebraic value 2 -5 is the opposite of -1

1,3x to the power m y-(n+1)xy+1 is a quadratic trinomial with respect to xy.

m+1=3m=2

n+1 is not equal to 0

n is not equal to -1

2, and -mab are the same kind of terms.

m is not equal to 03, m = 6

2m-4=n

n=12-4n=8

1.When m = 2 n≠ 1, the m power y-(n+1)xy+1 of 3x is a quadratic trinomial with respect to xy.

2.If sum -mab is of the same kind, then the value of m cannot be 0

3.In the polynomial u to the power of m v to the nth power + 3x to the power of m to the nth power y + the power of u to the power of 3m v to the 2n power of v to the 6th power of 4x to the power of y to the 2m-4th power (where m and n are positive integers), if exactly two of them are of the same kind, then m=? n=？

The answer to the first question is: If the daughter's current age is x years old, then the father's age is 91 x years old, and the age difference between the two is 91 2x years.

When the father's age is twice the daughter's current age, the daughter's age is 1 3 the father's current age, and the age difference between the two remains the same (20:32:41).

That is, the father's age is 2x years old, and the daughter's age is 1 3 (91 x), and the age difference between the two is still 91 2x years.

List the equation: 91 2 x 2 x 1 3 (91 x) x = 28 years.

The answer to the second question is: Let this calendar be arranged in a row of seven days of the week.

Then the four days circled by the square are , (15 and 22; 16 and 23 are on the same column, respectively).

Hope it helps.

Question 2: Let the first number be x

According to the title:

x+1+x+7+x+7+x+1=76

4x+16=76

4x=60x=15

15+1=16 15+7=22 15+7+1=23 Answer: These four days are the 15th, 16th, 22nd, and 23rd.

7.The equation is: 91-2x=2x-1 3(91-x) The numbers are listed according to the age difference between the father and the daughter.

11 questions, scale 1 is 30 scale scale.