题目内容
计算下列各式:
(1)(+7)+(-13);
(2)(
-
)×12-
;
(3)-22+3×(-1)2-(-4)×5;
(4)
-
+
.(结果保留2个有效数字)
(1)(+7)+(-13);
(2)(
| 1 |
| 2 |
| 1 |
| 3 |
| 9 |
(3)-22+3×(-1)2-(-4)×5;
(4)
| 3 |
| 5 |
| 3 | π |
(1)原式=7-13=-6;
(2)原式=6-4-3=2-3=-1;
(3)原式=-4+3-(-20)=-19;
(4)原式≈1.732-2.236+1.465≈0.96.
(2)原式=6-4-3=2-3=-1;
(3)原式=-4+3-(-20)=-19;
(4)原式≈1.732-2.236+1.465≈0.96.
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