来自段祥照的问题
【数学计算(x²-y²)(x+y)÷(x+y)²A.x-yB.x+yC.x²+y²D.x²-y²】
数学计算(x²-y²)(x+y)÷(x+y)²
A.x-yB.x+yC.x²+y²D.x²-y²
1回答
2020-04-2421:46
【数学计算(x²-y²)(x+y)÷(x+y)²A.x-yB.x+yC.x²+y²D.x²-y²】
数学计算(x²-y²)(x+y)÷(x+y)²
A.x-yB.x+yC.x²+y²D.x²-y²
答:
(x²-y²)(x+y)÷(x+y)²
=(x-y)(x+y)(x+y)÷(x+y)²
=x-y
选择A