问题 解答题
计算:
(1)4.7-(-8.9)-7.5-(+6);
(2)3
1
4
+(-2
3
5
)+5
1
4
+(-8
2
5
);
(3)2.7+(-8.5)-(+3.4)-(-1.2);
(4)-0.6-0.08+
2
5
-2
5
11
-0.92+2
5
11
答案

(1)4.7-(-8.9)-7.5-(+6)

=4.7+8.9-7.5-6

=13.6-13.5

=0.1;

(2)3

1
4
+(-2
3
5
)+5
1
4
+(-8
2
5

=3

1
4
-2
3
5
+5
1
4
-8
2
5

=3

1
4
+5
1
4
-2
3
5
-8
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
-2
5
11
-0.92+2
5
11

=-0.6+0.4-0.08-0.92-2

5
11
+2
5
11

=-0.2-1

=-1.2.

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