题目内容
计算题:
(1)2
×
÷(5
);
(2)(2
+
)(2
-
).
(1)2
| 12 |
| ||
| 4 |
| 2 |
(2)(2
| 3 |
| 5 |
| 3 |
| 5 |
(1)原式=2×2
×
×
=3×
=
;
(2)原式=(2
)2-(
)2=12-5=7.
| 3 |
| ||
| 4 |
| 1 | ||
5
|
| ||
| 5×2 |
| 3 |
| 10 |
| 2 |
(2)原式=(2
| 3 |
| 5 |
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题目内容
| 12 |
| ||
| 4 |
| 2 |
| 3 |
| 5 |
| 3 |
| 5 |
| 3 |
| ||
| 4 |
| 1 | ||
5
|
| ||
| 5×2 |
| 3 |
| 10 |
| 2 |
| 3 |
| 5 |