计算:(1)(+12)+(-14)-(-56)+(-27);(2)(-3.2)-(-8.1)-(+16.9)+(-1215);(3)(+325)+(-278)-(+3512)-(-535)+(-118

题目简介

计算:(1)(+12)+(-14)-(-56)+(-27);(2)(-3.2)-(-8.1)-(+16.9)+(-1215);(3)(+325)+(-278)-(+3512)-(-535)+(-118

题目详情

计算:
(1)(+12)+(-14)-(-56)+(-27);
(2)(-3.2)-(-8.1)-(+16.9)+(-1
2
15
)

(3)(+3
2
5
)+(-2
7
8
)-(+3
5
12
)-(-5
3
5
)+(-1
1
8
)-
(-5
5
12
)

(4)|-0.75|+(+3
1
4
)-9-(-0.125)+(-
5
8
)-|-0.125|
题型:解答题难度:中档来源:不详

答案

(1)原式=12+(-14)+56+(-27),
=12+56+(-14)+(-27),
=68+(-41),
=27;

(2)原式=(-3.2)+8.1+(-16.9)+(-1class="stub"2
15
),
=(-3.2)+(-16.9)+8.1+(-1class="stub"2
15
),
=-12+(-1class="stub"2
15
),
=-13class="stub"2
15


(3)原式=3class="stub"2
5
+(-2class="stub"7
8
)+(-3class="stub"5
12
)+5class="stub"3
5
+(-1class="stub"1
8
)+5class="stub"5
12

=3class="stub"2
5
+5class="stub"3
5
+(-2class="stub"7
8
)+(-1class="stub"1
8
)+5class="stub"5
12
+(-3class="stub"5
12
),
=9-4+2,
=7;

(4)原式=class="stub"3
4
+3class="stub"1
4
-9+class="stub"1
8
+(-class="stub"5
8
)-class="stub"1
8

=4-9-class="stub"5
8

=-5class="stub"5
8

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