题目内容
计算:
-
=______.
y |
y2-x2 |
1 |
y+x |
原式=
-
=
-
=
=
=
.
故答案为:
.
y |
(y+x)(y-x) |
1 |
y+x |
=
y |
(y+x)(y-x) |
y-x |
(y+x)(y-x) |
=
y-(y-x) |
(y+x)(y-x) |
=
x |
(y+x)(y-x) |
=
x |
y2-x2 |
故答案为:
x |
y2-x2 |
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