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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
)+1
+1
+(-5
);
(2)0-29.8-17.5+16.5-2.2+7.5;
(3)|-3
-(-2
)|-(|-5
|-|-
|);
(4)[1
-(-3.6+5.2)+4.2]-(-1
).
(1)(-2
3 |
4 |
3 |
4 |
1 |
3 |
1 |
3 |
(2)0-29.8-17.5+16.5-2.2+7.5;
(3)|-3
1 |
2 |
1 |
3 |
1 |
3 |
3 |
4 |
(4)[1
3 |
5 |
1 |
2 |
▼优质解答
答案和解析
(1)(-2
)+1
+1
+(-5
)
=[(-2
)+(-5
)]+[1
+1
]
=(-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
-(-2
)|-(|-5
|-|-
|)
=|-3
+2
|-(5
-
)
=1
-4
=-3
;
(4)[1
-(-3.6+5.2)+4.2]-(-1
)
=[1.6-1.6+4.2]+1.5
=4.2+1.5
=5.7.
3 |
4 |
3 |
4 |
1 |
3 |
1 |
3 |
=[(-2
3 |
4 |
1 |
3 |
3 |
4 |
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 |
1 |
3 |
1 |
3 |
3 |
4 |
=|-3
1 |
2 |
1 |
3 |
1 |
3 |
3 |
4 |
=1
1 |
6 |
7 |
12 |
=-3
5 |
12 |
(4)[1
3 |
5 |
1 |
2 |
=[1.6-1.6+4.2]+1.5
=4.2+1.5
=5.7.
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