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计算(1)(-9)-(-3.2)+(-4.3)(2)15-23+(-13)+1(3)20×(-54)+(-30)÷6(4)113×57-(-57)×523(5)15-23+(-13)+1(6)(512+23-34)×(-12)(7)(-612)×413-8÷|-4+2|

题目详情
计算
(1)(-9)-(-3.2)+(-4.3)
(2)
1
5
-
2
3
+(-
1
3
)+1 
(3)20×(-
5
4
)+(-30)÷6
(4)1
1
3
×
5
7
-(-
5
7
)×5
2
3
  
(5)
1
5
-
2
3
+(-
1
3
)+1   
(6)(
5
12
+
2
3
-
3
4
)×(-12)
(7)(-6
1
2
)×
4
13
-8÷|-4+2|
▼优质解答
答案和解析
(1)原式=-9-(-3.2+4.3)
=-9-1.1
=-10.1;

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


(3)原式=-25-5
=-30;

(4)原式=
4
3
×
5
7
+
5
7
×
17
3

=
5
7
×(
4
3
+
17
3

=
5
7
×
20
3

=
100
21


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


(6)原式=
5
12
×(-12)+
2
3
×(-12)-
3
4
×(-12)
=-5-8+9
=-4;

(7)原式=-
13
2
×
4
13
-8÷2
=-2-4
=-6.