(x-y)(x-y)2(y-x) (x+2y-?)(x-2y+?)
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(x-y)(x-y)2(y-x) (x+2y-?)(x-2y+?)
(x-y)(x-y)2(y-x)
(x+2y-?)(x-2y+?)
(x-y)(x-y)2(y-x) (x+2y-?)(x-2y+?)
x^2(x-y)+y^2(y-x)
=x^2(x-y)-y^2(x-y)
=(x-y)(x^2-y^2)
=(x-y)(x-y)(x+y)
=(x-y)^2(x+y)
我才6年级
第一题的2是平方还是别的,第二题有问号就更不知道了。
k . gv h
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x>y?x:y
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(x+y)(x-y)-(x-y)^2如题 (x+y)(x-y)-(x-y)^2
【2(x-y)(x-y)(x-y)-8(x-y)(x-y)(x+y)+6y(x-y)(x-y)]/2(x-y)(x-y)
x^2(x-y)+(y-x)
x(x-y)2-(y-x)3
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[(x-y)²+(x+y)(x-y)]除以2x
[2/3x-2/x+y(x+y/3x-x-y)]/x-y/x
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x^/y-x-y^/y-x化简.