题目内容
计算:
+
-
.
1 |
a |
1 |
b |
2a+b |
2ab |
原式=
+
-
=
=
=
=
.
2b |
2ab |
2a |
2ab |
2a+b |
2ab |
=
2b+2a-(2a+b) |
2ab |
=
2b+2a-2a-b |
2ab |
=
b |
2ab |
=
1 |
2a |
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题目内容
1 |
a |
1 |
b |
2a+b |
2ab |
2b |
2ab |
2a |
2ab |
2a+b |
2ab |
2b+2a-(2a+b) |
2ab |
2b+2a-2a-b |
2ab |
b |
2ab |
1 |
2a |