第十一题,答案已给出.
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第十一题,答案已给出.
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解11题
原式=[ (x-y)^4 -(x^4 -y^4) ]÷[ (x+y)(x-y) ]²
=[ (x-y)^4 -(x²+y²)(x+y)(x-y) ]÷[ (x+y)²(x-y)² ]
=(x-y)^4 ÷ [ (x+y)²(x-y)² ] -(x²+y²)(x+y)(x-y)÷[ (x+y)²(x-y)² ]
=(x-y)²/(x+y)² - (x²+y²)/[ (x+y)(x-y) ]
=(x-y)²/(x+y)² - (x²+y²)/(x²-y²)
正确答案应该选 C
原式=[ (x-y)^4 -(x^4 -y^4) ]÷[ (x+y)(x-y) ]²
=[ (x-y)^4 -(x²+y²)(x+y)(x-y) ]÷[ (x+y)²(x-y)² ]
=(x-y)^4 ÷ [ (x+y)²(x-y)² ] -(x²+y²)(x+y)(x-y)÷[ (x+y)²(x-y)² ]
=(x-y)²/(x+y)² - (x²+y²)/[ (x+y)(x-y) ]
=(x-y)²/(x+y)² - (x²+y²)/(x²-y²)
正确答案应该选 C