化简:1-x+yx-3y÷x2-y2x2-6xy+9y2= ___ .
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化简:1-
÷
x+y |
x-3y |
x
1-
x+y x-3y÷ x2-y2 x2-6xy+9y2=1- x+y x-3y• (x-3y)2 (x+y)(x-y)=1- x-3y x-y= x-y-x+3y x-y= 2y x-y.
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