题目内容
计算
(1)(-3)2-2÷(-
)
(2)
+
×
÷(-
)2
(3)180°-(38°45′+72.5°)
(1)(-3)2-2÷(-
| 1 |
| 2 |
(2)
| 3 | -64 |
| 16 |
|
| 2 |
(3)180°-(38°45′+72.5°)
(1)原式=9-2×(-2)
=9+4
=13;
(2)原式=-4+4×
÷2
=-4+4×
×
=-4+3
=-1;
(3)原式=180°-(38°45′+72°30′)
=179°60′-111°15′
=68°45′.
=9+4
=13;
(2)原式=-4+4×
| 3 |
| 2 |
=-4+4×
| 3 |
| 2 |
| 1 |
| 2 |
=-4+3
=-1;
(3)原式=180°-(38°45′+72°30′)
=179°60′-111°15′
=68°45′.
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