问题 解答题
计算
(1)-20+(-14)-(-18)-13
(2)42×(-
2
3
)+(-
3
4
)
÷(-0.25)
(3)-1
2
3
×(0.5-
2
3
)
÷1
1
9

(4)(2
1
2
-
1
6
+
1
4
)×(-24)

(5)-1101-[-3×( 2÷3 )2-
4
3
÷22].
答案

(1)-20+(-14)-(-18)-13

=-20-14+18-13

=-47+18

=-29;

(2)42×(-

2
3
)+(-
3
4
)÷(-0.25)

=-28+3

=-25;

(3)-1

2
3
×(0.5-
2
3
1
1
9

=-

5
3
×(-
1
6
)÷1
1
9

=

5
18
÷1
1
9

=

1
4

(4)(2

1
2
-
1
6
+
1
4
)×(-24)

=-2

1
2
×24+
1
6
×24-
1
4
×24

=-60+4-6

=-62;

(5)-1101-[-3×( 2÷3 )2-

4
3
÷22]

=-1-[-3×

4
9
-
4
3
÷4]

=-1-[-

4
3
-
1
3
]

=-1+

5
3

=

2
3

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