题目内容
计算:
(1)(
+
)+(
-
)
(2)(
+
)÷
.
(1)(
| 12 |
| 20 |
| 3 |
| 5 |
(2)(
| 80 |
| 40 |
| 5 |
(1)原式=2
+2
+
-
=3
+
;
(2)原式=(4
+2
)÷
=4
÷
+2
÷
=4+2
.
| 3 |
| 5 |
| 3 |
| 5 |
=3
| 3 |
| 5 |
(2)原式=(4
| 5 |
| 10 |
| 5 |
=4
| 5 |
| 5 |
| 10 |
| 5 |
=4+2
| 2 |
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