Where can I find 7th grade math improvement questions?

Final math exam questions for the first semester of the first semester of junior high school.

Shift Name

Scoring (45 minutes to complete).

1. Fill-in-the-blank questions (3 points per question, 36 points in total).

If the opposite of a number is, then the number is ———

3,400,000 is expressed as ——— by scientific notation

If a=3 is known, then |5-a|+|1-a|=———

The number of times of the monomial -6x2y3z is ———

Polynomial 2-3xy2+4x2 is a ——— ——— term.

Simplification: 4xy

3（2x+xy）-

2xy=———

If the purchase price of a product is 40 yuan and the selling price is 60 yuan, its profit margin is ———

Calculation: -14-(-2)2

The solution of the known equation ax-5=0 is x=

then a=———

The standard form of a unitary equation is ———

When x=y=2, the algebraic formula 2x2-y+3=———

12) If a and b are opposite to each other, then 2a+2b

2. Multiple choice questions: (3 points for each question).

1. Equation y-=

The solution to 5 is ().

a y=9,2, 3 times of a number minus 6 is equal to 3, then this number is (), and the sum of a polynomial and x2-2x+1 is equal to -3x+2, then this polynomial is ()a-x2+x+1

b.-x2+x-1

c.-x2-x-1

d.-x2-x+1

4. The following results are positive ().

a.-|2|

b.-|3）|

c.-|1）|

d.-（3）

5. The significant digits reserved for approximate numbers are ().

a.Two, bThree, cFive, dSix.

6. In the following equations, the unary equation is ().

b.+5x=3

3. Answers (7 points for each question, 28 points in total).

1) Calculation: -2

2) Simplification evaluation: (1+a.)

5a)-(a+2a, where a=-3.)

3) Solve the equation: 4(3y+1)-4(y+2)=3(1-y) Solve the equation: -=1

4. Column equation solution application problems: (9 points for each sub-question).

1. A two-digit number, the number on the single digit is 3 times the number on the ten-digit, if the number on the ten-digit and the number on the single-digit are reversed, then the two-digit number obtained is 18 larger than the original two-digit number. Find the two digits after the switch.

2. Xiao Wang originally planned to take 6 hours to get from A to B, but because of urgency, he accelerated by 2 kilometers per hour, but it took 5 hours to arrive, seeking the distance between A and B.

Wouldn't it be better to do a set of test papers, I hope you are satisfied.

1 All 1Circumference l=2 (length + width), substitution:

4=2 (m-n + width).

Solution: width = 2-m+n

Answer: The length of the other side is: 2-m+n

It can be reduced to: 5-(x-y)+3[-(x-y)] 3

Substituting x-y=3 into the :

5-(x-y)+3[-(x-y)]^3

3.-x^3+2x^2+2006

[(x^3-2x^2-1)]+2005=-(x+1)(x^2-x-1)+2005=-(x+1)*0+2005

4.The tens are: x

The single digit is: x-3

The number of hundreds: 3 (x-3).

So: this number is:

3 (x-3) * 100 + x * 10 + (x-3) simplified to:

This number is: 289x-903

b = = 7 * cm = 165 cm. 2)b=

This number is closest to the meter, so this footprint belongs to the person of the meter.

6.Because I read it wrong. So there is:

a-n=3a

Solution: n=-2a

Substituting n=-2a into a+n yields:

a+n=a-2a

a, so a+n is -a

7.Because: 3x 2+my-8)-(nx 2+2y+7)=(3+n)x 2+(m-2)y-15

Because the difference between the polynomial 3x 2+my-8 and the polynomial-nx 2+2y+7 does not contain x and y

So: 3+n=0 (1).

m-2=0 (2)

Solution: n=-3

m = 2 substituting n m + mn to get :

n^m+mn=(-3)^2+2*(-3)

3So: n m+mn=3

1：4m/2-(m-n)=2m-m+n=m-n

2：x-y=3

y-x=-(x-y)=-3

5-x+y+3(y-x)^3=5+(y-x)+3(y-x)^3=5+(-3)+3*(-3)^3=5-3-3*(-27)=5-3-81=79

3：x^2-x-1=0 x^2-x=1

x^3+2x^2+2006=-x^3+x^2+x^2+2006=-(x^3-x^2)+x^2+2006

x*(x^2-x)+x^2+2006=-x*1+x^2+2006=x^2-x+2006

x^2-x-1+2007=(x^2-x-1)+2007=2007

3.-x^3+2x^2+2006

[(x^3-2x^2+1)]+2007

(x-1)(x^2-x-1)+2007

(x-1)*0+2005

4:3(x-3)*100+10*x+x-3=311x-903

b = = 7 * cm = 165 cm.

2) b = 7 * = this number is closest to the meter, so this footprint is the person of the meter.

6.Because I read it wrong. So there is:

a-n=3a

Solution: n=-2a

Substituting n=-2a into a+n yields:

a+n=a-2a=-a

So a+n is -a

7.Because: 3x 2+my-8)-(nx 2+2y+7).

3+n)x^2+(m-2)y-15

Because the difference between the polynomial 3x 2+my-8 and the polynomial-nx 2+2y+7 does not contain x and y

That is, the coefficient of each item containing x and y is 0, so:

3+n=0 (1)

m-2=0 (2)

Solution: n=-3

m = 2 substituting n m + mn to get :

n^m+mn=(-3)^2+2*(-3)=9-6=3

Let me help you, Satoshi Zheye

These are the math problems of the seventh grade, and they are all classified by knowledge points, you go directly to click on the entrance of the junior high school, select mathematics ==" synchronous practice and click on one to enter, which is the math practice questions in the seventh grade.

Midterm Quality Survey 7th Grade Mathematics Papers.

Answer questions: (7 points per question, 28 points in total).

26 On Sunday, Xiao Ming was running back and forth on a north-south road, starting from place A and recording his running every 10 minutes (positive to the south, in meters).

Stopping to rest after 1 hour, in what direction is he in place A at this time? How far is it from place a? How many meters did Xiao Ming run.

27 Orchards A and B have 10 tons and 40 tons of apples respectively, all of which are transported to C and D, while C and D need 15 tons and 35 tons of apples respectively; The known freight rates from A and B to C and D are as follows:

Freight rate to C Freight rate to D place.

A orchard 15 yuan per ton 12 yuan per ton.

b orchard 10 yuan per ton 9 yuan per ton.

1) If the number of apples transported from orchard B to place C is x tonnes, then the apples transported from orchard B to place D are tonnes; The cost of transporting apples from orchard A to place D is $.

2) Use the formula containing x to express the total transportation cost (requirement: list the equation and simplify).

29 (Magic in Playing Cards) The magician does the magic according to the following rules: take a number of playing cards, divide them into three equal parts, and put them on the left, middle, and right, and take two cards from the left pile and put them in the middle pile for the first time, take one from the right pile and put them in the middle pile for the second time, and take some from the middle pile and put them in the left pile for the third time, so that the number of cards on the left is twice as many as the original

1) The magician starts with 8 cards per copy, according to this rule, how many cards do you think are left in the middle of the pile?

2) The magician took another deck of 54 playing cards, and drew 1 king and 1 king, according to this rule changed again, the clever Xiaohui immediately said to the magician: "You don't change this magic again, as long as you put any cards of the same number at the beginning, I know how many cards are left in the middle of the pile, I think of the mystery!" "Please help Xiaohui uncover this mystery (request:

Use what you have learned to write down the secret process), you will definitely succeed!

1. m=2 n=-2 n^m=4

3.The first class is x, the second class is 2x+8, and the third class is 1 2 (2x+8)-6

x+2x+8+1 2(2x+8)-6=4x+6 trees.

4.The second side is 8a+8b-4, and the third side is 48-(3a+2b)-(8a+8b-4)=52-11a-11b

943022758, alright, let's go.

In the same plane, there is an intersection point, and these two straight lines are called [ ].

In the same plane, there is no intersection point, and these two straight lines are called [ ].