(0.3x-3y)^2-(0.3x+3y)^2
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(0.3x-3y)^2-(0.3x+3y)^2
(0.3x-3y)^2-(0.3x+3y)^2
=(0.3x-3y+0.3x+3y)(0.3x-3y-0.3x-3y)
=0.6x(-6y)
=-3.6xy
=(0.3x-3y+0.3x+3y)(0.3x-3y-0.3x-3y)
=0.6x(-6y)
=-3.6xy
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)
化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方
【x-3y][x+y]-[x-2y][x +2y]-[x-y
有这样一道题:"计算(2*x*x*x-3*x*x*y-2*x*y*y)-(x*x*x-2*x*y*y+y*y*y)+【-
3(x+y)+2(x-y)=20 0.3x+0.6y=60 x=?y=?
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(x-y)^2-(x-y)^3因式分解
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