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2013-10-16 · 知道合伙人教育行家
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(x²-y²)(x+y)÷(x+y)²
=(x-y)(x+y)(x+y)÷(x+y)²
=(x-y)(x+y)²÷(x+y)²
=x-y
=(x-y)(x+y)(x+y)÷(x+y)²
=(x-y)(x+y)²÷(x+y)²
=x-y
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(x²-y²)(x+y)÷(x+y)²
=(x-y)(x+y)(x+y)÷(x+y)²
=x-y
=(x-y)(x+y)(x+y)÷(x+y)²
=x-y
追问
=(x-y)(x+y)(x+y)÷(x+y)²
怎么化简过来的,我还没学因式分解
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=(x-y)(x+y)(x+y)×1/(x+y)^2
=(x-y)(x+y)^2 ×1/(x+y)^2
=x-y
=(x-y)(x+y)^2 ×1/(x+y)^2
=x-y
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原式=(x-y)*(x+y)*(x+y)/(x+y)^2
=x-y
=x-y
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