题目内容
计算或化简:
(1)(2
+
)(
-2
)
(2)
-
-
(3)(3
-2
+
)÷2
(4)sin230°+cos245°+sin60°•tan45°.
(1)(2
| 3 |
| 20 |
| 12 |
| 5 |
(2)
| 9m |
| m |
| 3 |
|
| 1 |
| 2m |
| m3 |
(3)(3
| 12 |
|
| 48 |
| 3 |
(4)sin230°+cos245°+sin60°•tan45°.
(1)(2
| 3 |
| 20 |
| 12 |
| 5 |
=(2
| 3 |
| 4×5 |
| 4×3 |
| 5 |
=(2
| 3 |
| 5 |
| 3 |
| 5 |
=(2
| 3 |
| 5 |
=12-20,
=-8;
(2)
| 9m |
| m |
| 3 |
|
| 1 |
| 2m |
| m3 |
=3
| m |
| m |
| 3 |
| ||
| m |
| 1 |
| 2m |
| m |
=3
| m |
| ||
| 3 |
| ||
| 2 |
=(3-
| 1 |
| 3 |
| 1 |
| 2 |
| m |
=
| 13 |
| 6 |
| m |
(3)(3
| 12 |
|
| 48 |
| 3 |
=(3×2
| 3 |
| ||
| 3 |
| 3 |
| 3 |
=
28
| ||
| 3 |
| 3 |
=
| 14 |
| 3 |
(4)sin230°+cos245°+sin60°•tan45°,
=(
| 1 |
| 2 |
| ||
| 2 |
| ||
| 2 |
=
| 1 |
| 4 |
| 1 |
| 2 |
| ||
| 2 |
=
| 3 |
| 4 |
| ||
| 2 |
=
3+2
| ||
| 4 |
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