帮我找15道初一的计算题

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帮我找15道初一的计算题

帮我找15道初一的计算题
帮我找15道初一的计算题

帮我找15道初一的计算题
1.-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+(-7m7n12)0-2(mn)-4•m11•n8
3.(5x2y3-4x3y2+6x)÷6x,其中x=-2,y=2 ⑹ (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=______.
5.23a3bc2-15ab2c+8abc-24a3bc2-8abc=______.
6.-7x2+6x+13x2-4x-5x2=______.
7.2y+(-2y+5)-(3y+2)=______.
8.(2x2-3xy+4y2)+(x2+2xy-3y2)=______.
9.2a-(3a-2b+2)+(3a-4b-1)=______.
10.-6x2-7x2+15x2-2x2=______.
11.2x-(x+3y)-(-x-y)-(x-y)=______.
12.2x+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.