题目内容
计算:(
-
)÷
.
x |
y |
y |
x |
x+y |
x |
原式=
•
=
•
=
.
x2-y2 |
xy |
x |
x+y |
=
(x+y)(x-y) |
xy |
x |
x+y |
=
x-y |
y |
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题目内容
x |
y |
y |
x |
x+y |
x |
x2-y2 |
xy |
x |
x+y |
(x+y)(x-y) |
xy |
x |
x+y |
x-y |
y |