题目内容
计算:[(
-
)÷(x+y)+x(
-
)]÷
•
.
x |
y |
y |
x |
1 |
y |
1 |
x |
1+x |
y |
x-y |
x |
原式=[
•
+
]•
•
,
=(
+
)•
•
,
=
•
•
,
=
.
(x-y)(x+y) |
xy |
1 |
x+y |
x-y |
y |
y |
1+x |
x-y |
x |
=(
x-y |
xy |
x-y |
y |
y |
1+x |
x-y |
x |
=
(x-y)(1+x) |
xy |
y |
1+x |
x-y |
x |
=
(x-y)2 |
x2 |
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