题目内容
计算:
(1)4.7-(-8.9)-7.5-(+6);
(2)3
+(-2
)+5
+(-8
);
(3)2.7+(-8.5)-(+3.4)-(-1.2);
(4)-0.6-0.08+
-2
-0.92+2
.
(1)4.7-(-8.9)-7.5-(+6);
(2)3
| 1 |
| 4 |
| 3 |
| 5 |
| 1 |
| 4 |
| 2 |
| 5 |
(3)2.7+(-8.5)-(+3.4)-(-1.2);
(4)-0.6-0.08+
| 2 |
| 5 |
| 5 |
| 11 |
| 5 |
| 11 |
(1)4.7-(-8.9)-7.5-(+6)
=4.7+8.9-7.5-6
=13.6-13.5
=0.1;
(2)3
+(-2
)+5
+(-8
)
=3
-2
+5
-8
=3
+5
-2
-8
=8.5-11
=-2.5;
(3)2.7+(-8.5)-(+3.4)-(-1.2)
=2.7-8.5-3.4+1.2
=3.9-11.9
=-8;
(4)-0.6-0.08+
-2
-0.92+2
=-0.6+0.4-0.08-0.92-2
+2
=-0.2-1
=-1.2.
=4.7+8.9-7.5-6
=13.6-13.5
=0.1;
(2)3
| 1 |
| 4 |
| 3 |
| 5 |
| 1 |
| 4 |
| 2 |
| 5 |
=3
| 1 |
| 4 |
| 3 |
| 5 |
| 1 |
| 4 |
| 2 |
| 5 |
=3
| 1 |
| 4 |
| 1 |
| 4 |
| 3 |
| 5 |
| 2 |
| 5 |
=8.5-11
=-2.5;
(3)2.7+(-8.5)-(+3.4)-(-1.2)
=2.7-8.5-3.4+1.2
=3.9-11.9
=-8;
(4)-0.6-0.08+
| 2 |
| 5 |
| 5 |
| 11 |
| 5 |
| 11 |
=-0.6+0.4-0.08-0.92-2
| 5 |
| 11 |
| 5 |
| 11 |
=-0.2-1
=-1.2.
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