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计算:(1)(-234)+134+113+(-513);(2)0-29.8-17.5+16.5-2.2+7.5;(3)|-312-(-213)|-(|-513|-|-34|);(4)[135-(-3.6+5.2)+4.2]-(-112).

题目详情
计算:
(1)(-2
3
4
)+1
3
4
+1
1
3
+(-5
1
3
);
(2)0-29.8-17.5+16.5-2.2+7.5;
(3)|-3
1
2
-(-2
1
3
)|-(|-5
1
3
|-|-
3
4
|);
(4)[1
3
5
-(-3.6+5.2)+4.2]-(-1
1
2
).
▼优质解答
答案和解析
(1)(-2
3
4
)+1
3
4
+1
1
3
+(-5
1
3

=[(-2
3
4
)+(-5
1
3
)]+[1
3
4
+1
1
3
]
=(-8)+3
=-5;
(2)0-29.8-17.5+16.5-2.2+7.5
=(-29.8-17.5-2.2)+(16.5+7.5)
=(-49.5)+24
=-25.5;
(3)|-3
1
2
-(-2
1
3
)|-(|-5
1
3
|-|-
3
4
|)
=|-3
1
2
+2
1
3
|-(5
1
3
-
3
4

=1
1
6
-4
7
12

=-3
5
12

(4)[1
3
5
-(-3.6+5.2)+4.2]-(-1
1
2

=[1.6-1.6+4.2]+1.5
=4.2+1.5
=5.7.