计算9-12(x-y)+4(x+y)^2 81(a-b)^2-4(a+v)^2 -2x^3+8x^2-8x
(2x+y)(2x-3y)+x(2y+y) 2a(x-y)-4b(x-y)
a*b=2×a+b 计算x*2x*3x*4x*5x*6x*7x*8x*9x=3039 x=
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计算(1)x/x+y-x/x-y (2)a+2+4/a+2 (3)x^2-y^2/xy÷(x+y)
计算下面的题(过程)(a-b)(-a-b)(x-y)(y+x)^2(x-y+z)^2(x^2+y^2)(x^4+y^4)
(1)计算:a-(a^2)/(a+1)-1 (2)计算:3x/(x-4y)+(x+y)/(4y-x)-7y/(x-4y)
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
分解因式1.(a-b)x^2+9(b-a) 2.(x-y)(x-y+2)+1 3.x^2+2x-8 4.(x^2+4)^
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计算 1.[(a+b)^2-(a+b)(a-b)]÷(-b) 2.[(x+y)(2x+y)+(x+y)(x-y)]÷3x
化简3x^2y+(2x-5x^2y)还有2x-(2-5x),a-(2a-3b)+(3a-4b),8x+2y+2(5x-2
分解因式1.2a(x-y)-3b(y-x)2.-x^y-2xy+35y3.a^(x-y)-4b^(x-y)若|a+2|+