题目内容
计算
+(-2)2×
-(
-1)0+sin45°-(-2)-1.
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原式=
-1+4×
-1+
+
=
-1+2-1+
+
,
=
+
.
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| 2 |
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| 2 |
=
| 2 |
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| 2 |
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| 2 |
=
3
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| 2 |
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| 2 |
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