计算(1)(-3.6)+(+2.5)(2)3-2×(-5)2(3)-24×(-56+38-112)(4)12+(-23)+45+(-12)+(-13)(5)-1...

2023-07-08 06:15发布

这道初中数学的题目是:
计算 
(1)(-3.6)+(+2.5)
(2)3-2×(-5)2
(3)-24×(-
5
6
+
3
8
-
1
12
)

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

(5)-14-(
13
14
-
11
12
)×[4-(-2)2]

(6)5×(-6)-(-4)2÷(-8)
(7)-7.2-0.9-5.6+1.7
(8)(-1
3
5
)+(-3.2)+|-1.8|
1条回答
上网找工作
2023-07-08 06:26
这道初中数学题的正确答案为:
(1)(-3.6)+(+2.5)=-1.1;

(2)3-2×(-5)2
=3-2×25
=3-50
=-47;

(3)-24×(-
5
6
+
3
8
-
1
12
)

=24×
5
6
-24×
3
8
+24×
1
12

=20-9+2
=13;

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

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

=0-1+
4
5

=-
1
5


(5)-14-(
13
14
-
11
12
)×[4-(-2)2]

=-1-(
13
14
-
11
12
)×[4-4]
=-1-(
13
14
-
11
12
)×0
=-1-0
=-1;

(6)5×(-6)-(-4)2÷(-8)
=-30-16÷(-8)
=-30+2
=-28;

(7)-7.2-0.9-5.6+1.7
=-13.7+1.7
=-12;

(8)(-1
3
5
)+(-3.2)+|-1.8|

=-1.6-3.2+1.8
=-4.8+1.8
=-3.
解题思路 56

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