问题 解答题
计算(1)(-
1
2
)-(-3
1
4
)+(+2
3
4
)-(+5
1
2
)

(2)(-6)÷(-0.25)×
11
24

(3)-2+(1-0.2÷
3
5
)×(-3)

(4)-14-
1
6
×[2-(-3)2]
答案

(1)(-

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

=(-

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

=[(-

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

=(-6)+6

=0; 

(2)(-6)÷(-0.25)×

11
24

=(-6)×(-4)×

11
24

=24×

11
24

=11;

(3)-2+(1-0.2÷

3
5
)×(-3)

=-2+(1-

1
5
×
5
3
)×(-3)

=-2+

2
3
×(-3)

=-2+(-2)

=-4;

(4)-14-

1
6
×[2-(-3)2]

=-1-

1
6
×[2+(-9)]

=-1-

1
6
×(-7)

=-1+

7
6

=

1
6

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