题目内容
计算:
(1)(
+
)+(
-
);
(2)(
-1)(
+1)(结果保留小数后两位)
(1)(
| 3 |
| 6 |
| 6 |
| 3 |
(2)(
| 10 |
| 5 |
(1)原式=
+
+
-
=2
;
(2)原式=5
+
-
-1
≈5×1.414+3.162-2.236-1
=7.070+3.162-2.236-1
=6.996
≈7.00.
| 3 |
| 6 |
| 6 |
| 3 |
| 6 |
(2)原式=5
| 2 |
| 10 |
| 5 |
≈5×1.414+3.162-2.236-1
=7.070+3.162-2.236-1
=6.996
≈7.00.
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