问题
解答题
计算: (1)4.7-(-8.9)-7.5-(+6); (2)3
(3)2.7+(-8.5)-(+3.4)-(-1.2); (4)-0.6-0.08+
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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
+(-21 4
)+53 5
+(-81 4
)2 5
=3
-21 4
+53 5
-81 4 2 5
=3
+51 4
-21 4
-83 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+
-22 5
-0.92+25 11 5 11
=-0.6+0.4-0.08-0.92-2
+25 11 5 11
=-0.2-1
=-1.2.