问题 解答题
计算
(1)-20-(+14)+(-18)-(-13)
(2)-2
3
4
-(-
1
8
)+3
3
8
+(-2
1
4
)

(3)(-81)÷2
1
4
×(-
1
9
)÷4

(4)(-7)×(-5)-90÷(-15)
(5)(-36)×(
3
4
-
5
6
+
7
9
)

(6)-42÷(-
1
2
)÷(-1)7+(1
1
8
+1
1
3
-
3
4
)×24
答案

(1)原式=-20-14-18+13

=-38-1

=-39;

(2)原式=-2

3
4
-2
1
4
+
1
8
+3
3
8

=-5+3

1
2

=-1

1
2

(3)原式=-81×

4
9
×(-
1
9
)×
1
4

=1;

(4)原式=35+6

=41;

(5)原式=-36×

3
4
-36×(-
5
6
)-36×
7
9

=-27+30-28

=-25;

(6)原式=-16×(-2)×(-1)+24+

1
8
×24+24+
1
3
×24-
3
4
×24

=-32+24+3+24+8-18

=-40+51

=9.

多项选择题
多项选择题