问题 解答题
细心算一算
①4.8-(-1.2)+(-6);
(-
3
4
)×(-1
1
2
)÷(-2
1
4
)

③1-(5-7)÷(-3)3
-62×(
2
3
-
1
2
)-23
答案

①4.8-(-1.2)+(-6)

=4.8+1.2-6

=0;

(-

3
4
)×(-1
1
2
)÷(-2
1
4
)

=-

3
4
×
3
2
×
4
9

=-

1
2

③1-(5-7)÷(-3)3

=1-(-2)÷(-27)

=1-

2
27

=

25
27

-62×(

2
3
-
1
2
)-23

=-36×

1
6
-8

=-14.

单项选择题
单项选择题