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(x的2次方-xy-2(y)的2次方)分之(x的2次方-y的2次方)=( )分之(x-y)
人气:237 ℃ 时间:2019-10-29 15:17:56
解答

(x²-y²)/(x²-xy-2y²)
=(x-y)(x+y)/(x-2y)(x+y)
=(x-y)/(x-2y)
=(x-2y)分之(x-y)
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