[(x-2y)^2-2(x+y)(3x-y)-6y^2]÷2x
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[(x-2y)^2-2(x+y)(3x-y)-6y^2]÷2x
其中x=-2
y=1/2
(快点、、没时间了)
=、=希望有人帮下、、
其中x=-2
y=1/2
(快点、、没时间了)
=、=希望有人帮下、、
先化简,合并同类项,化简结果是(-5/2)x,然后把x=-2带入,结果等于5
计算:(x-y)^7÷(y-x)^6+(-x-y)^3÷(x+y)^2
1.((y+2x)(-2x+y)+4(x+2y)^2)/3y 2.(2(x-y)^3-8(x-y)^2(x+y)+6y(
[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
1、x(x-y)(x+y)-x(x+y)^2
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/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
[(3x+y)(x-y)-(2x+3y)(x-y)]*(x-y)
因式分解3x^2(x-y)+6x(y-x)
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)+【-
【2(x-y)^3-8(x-y)^2(x+y)+6y(x-y)^2】/2(x-y)^2=
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013