问题 解答题
计算
(1)(-38)+52+118+(-62)
(2)(-3
2
3
)-(-2
3
4
)-(-1
2
3
)-(+1.75)

(3)|-
7
9
|÷(
2
3
-
1
5
)-
1
3
×(-4)2
       
(4)-22÷
4
3
-[22-(1-
1
2
×
1
3
)]×12
答案

(1)(-38)+52+118+(-62)

=(-38-62)+(52+118)

=-100+170

=70;

(2)(-3

2
3
)-(-2
3
4
)-(-1
2
3
)-(+1.75)

=(-3

2
3
+1
2
3
)+(2.75-1.75)

=-1+1

=0;

(3)|-

7
9
|÷(
2
3
-
1
5
)-
1
3
×(-4)2    

=

7
9
÷
7
15
-
1
3
×16

=

5
3
-
16
3

=-3

2
3

   

(4)-22÷

4
3
-[22-(1-
1
2
×
1
3
)]×12

=-4÷

4
3
-[4-(1-
1
6
)]×12

=-3-[4-

5
6
]×12

=-3-

19
6
×12

=-3-38

=-41.

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