Math test questions in chapter 1 of the first volume of the first day of junior high school.

-3(x2-xy)-x(-2y+2x) ⑵ (-x5)？ x3n- 1+x3n？ (-x)4

2.(x+2)(y+3)-(x+ 1)(y-2)⑷(-2m2n)3？ mn+(-7m7n 12)0-2(mn)-4？ m 1 1？ n8

3.(5x2y3-4x3y2+6x)÷6x, where x =-2 and y = 2 [6] (3mn+1) (3mn-1)-(3mn-2) 2.

4.9992- 1 ⑻ 20032

5.-2.5×(-4.8)×(0.09)÷(-0.27)

3.3ab-4ab+8ab-7ab+ab=______。

4.7x-(5x-5y)-y=______。

5.23 a3 BC 2- 15 ab2c+8 ABC-24 a3 BC 2-8 ABC = _ _ _ _ _ _。

6.-7x 2+6x+ 13 x2-4x-5x 2 = _ _ _ _ _ _。

7.2y+(-2y+5)-(3y+2)=______。

8.(2 x2-3xy+4 y2)+(x2+2xy-3 y2)= _ _ _ _ _ _。

9.2a-(3a-2 b+2)+(3a-4 b- 1)= _ _ _ _ _ _。

10.-6x2-7x2+ 15x2-2x2=______。

1 1.2x-(x+3y)-(-x-y)-(x-y)= _ _ _ _ _ _。

12.2 x+2y-[3x-2(x-y)]= _ _ _ _ _ _。

13.5-( 1-x)- 1-(x- 1)= _ _ _ _ _ _。

14.()+(4xy+7x2-y2)= 10x2-xy。

15.(4xy2-2x2y)-( )=x3-2x2y+4xy2+y3。

16. Given A=x3-2x2+x-4 and B=2x3-5x+3, calculate a+b = _ _ _ _.

17. Given A=x3-2x2+x-4 and B=2x3-5x+3, calculate a-b = _ _ _ _.

18. if a=-0.2 and b=0.5, the value of algebraic expression -(|a2b|-|ab2|) is _ _ _ _.

19. If a polynomial subtracts 3m4-m3-2m+5 to get -2m4-3m3-2m2- 1, then this polynomial is equal to _ _ _ _.

20.-(2 x2-y2)-[2 y2-(x2+2xy)]= _ _ _ _ _ _。

2 1. If -3a3b2 and 5ax- 1by+2 are similar terms, then x=______, and y = _ _ _ _ _.

22.(-y+6+3 y4-y3)-(2 y2-3 y3+y4-7)= _ _ _ _ _ _。

23. The result of simplifying the algebraic expression 4x2-[7x2-5x-3( 1-2x+x2)] is _ _ _ _.

24.2 a-B2+c-D3 = 2a+()-D3 = 2a-D3-()= c-()。

25.3a-(2a-3b)+3(a-2b)-b=______。

26. The simplified algebraic expression x-[y-2x-(x+y)] is equal to _ _ _ _ _.

27.[5a 2+()a-7]+[()a2-4a+()]= a2+2a+ 1。

28.3x-[y-(2x+y)]=______。

29.Simplify | 1-x+y |-x-y | (where x < 0, y > 0) equals _ _ _ _.

30. It is known that x≤y, x+y-| x+y-| x-y | = _ _ _ _ _

3 1. Known x < 0, y < 0, simplified | x+y |-| 5-x-y | = _ _ _.

32.4a2n-an-(3an-2a2n)=______。

33. If a polynomial is added with 2xy+3xy2-x2+2xy-3xy-4, then the polynomial is _ _ _ _ _.

34.-5xm-xm-(-7xm)+(-3xm)=______。

35. When a=- 1 and b=-2, [a-(b-c)]-[-b-(-c-a)] = _ _ _.

36. When a=- 1, b= 1, c=- 1,-[b-2 (-5a)]-(-3b+5c) = _ _.

37.-2(3x+z)-(-6x)+(-5y+3z)=______。

38.-5an-an+ 1-(-7an+ 1)+(-3an)= _ _ _ _ _ _。

39.3 a-(2a-4 b-6c)+3(-2c+2b)= _ _ _ _ _ _。

40.9 a2+[7 a2-2a-(-a2+3a)]= _ _ _ _ _ _。

4 1. When 2y-x=5, 5 (x-2y) 2-3 (-x+2y)-100 = _ _ _.

97. Given a+b=2 and a-b=- 1, find the value of 3(a+b)2(a-b)2-5(a+b)2×(a-b)2.

98. It is known that A=a2+2b2-3c2, B=-b2-2c2+3a2, C=c2+2a2-3b2, and find (A-B)+C. 。

99.Find (3x2y-2x2y)-(xy2-2x2y), where x=- 1 and y = 2.

10 1. Given |x+ 1|+(y-2)2=0, find the value of algebraic expression 5(2x-y)-3(x-4y).

106. when P=a2+2ab+b2 and Q=a2-2ab-b2, find p-[q-2p-(p-q)].

107. Find the value of 2x2-{-3x+5+[4x2-(3x2-x=-3. 1)], where x =-3.

1 10. When x=-2, y=- 1 and z=3, find the value of 5xyz-{2xxy-[3xyz-(4xy2-x2y)]}.

1 13. Given A=x3-5x2 and B=x2-6x+3, find a-3 (-2b).

1 15. Remove the brackets: {-[-(a+b)]}-{-[-(a-b)]}.

1 16. Delete the brackets: -[-(-x)-y]-[+(-y)-(+x)].

1 17. Given A=x3+6x-9 and B=-x3-2x2+4x-6, calculate 2A-3B, and put the result in brackets with "-"in front.

1 18. Calculate the following formula and put the result in brackets with "-"in front:

(-7 y2)+(-4y)-(-y2)-(+5y)+(-8 y2)+(+3y)。

1 19. Remove the brackets, merge similar items, and arrange the results according to the ascending power of x, and put the last three items in brackets with "-":

120. Without changing the value of the following formula, change the symbol before each bracket to the opposite symbol: (x3+3x2)-(3x2y-7xy)+(2y3-3y2).

12 1. Put the cubic term of polynomial 4x2y-2xy2+4xy+6-x2y2+x3-y2 in brackets with "-"in front, the quadratic term in brackets with "+"in front, and the quartic term and constant term in brackets with "-"in front.

122. Remove the brackets of the following polynomials, combine similar terms, put them in brackets with "-"in front, and then find the value of 2x-2[3x-(5x2-2x+ 1)]-4x2, where x =- 1.

123. Merge similar items: 7x-1.3z-4.7-3.2x-y+2.1z+5-0.1y.

124. Merge similar items: 5m2n+5mn2-Mn+3m2n-6mn2-8mn.

126. Remove brackets and merge similar items:

( 1)(m+ 1)-(-n+m)；

(2)4m-[5m-(2m- 1)]。

127. Simplified: 2x2-{-3x-[4x2-(3x2-x)+(x-x2)]}.

128. Simplification:-(7x-y-2z)-{[4x-(x-y-z)-3x+z]-x}.

129. Calculation: (+3a)+(-5a)+(-7a)+(-31a)-(+4a)-(-8a).

130. Simplification: a3-(a2-a)+(a2-a+1)-(1-a4+a3).

13 1. Combine the similar items of x2-8x+2x3- 13x2-2x-2x3+3 and evaluate them, where x =-4.

132. Fill in the appropriate items in brackets: [()-9y+()]+2y2+3y-4 =11y2-()+13.

133. Fill in the appropriate items in brackets: (-x+y+z) (x+y-z) = [y-()] [y+()].