题目内容
计算:
①
•
÷
②
-
+
.
①
a+2 |
a2-2a+1 |
a2-4a+4 |
a+1 |
a2-4 |
a2-1 |
②
x |
y |
y |
x |
x2+y2 |
xy |
①原式=
•
•
=
;
②原式=
-
+
=
=
.
a+2 |
(a-1)2 |
(a-2)2 |
a+1 |
(a+1)(a-1) |
(a+2)(a-2) |
=
a-2 |
a-1 |
②原式=
x2 |
xy |
y2 |
xy |
x2+y2 |
xy |
=
x2-y2+x2+y2 |
xy |
=
2x |
y |
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