神马作文网第十一题,答案已给出.
来源：学生作业帮 编辑：神马作文网作业帮 分类：数学作业 时间：2024/11/12 00:11:17
第十一题,答案已给出.
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