问题 解答题
计算:①(-16.8)÷(-3);
(-
5
4
)÷(-
4
5
)

(+5
1
3
) ÷(-3
1
3
)

(+1.25)÷(-0.5)÷(-
5
8
)

⑤-18÷(+3.25)÷(-2
1
4
)
答案

①原式=16.8÷3,

=16.8×

1
3

=5.6;

②原式=

5
4
÷
4
5

=

5
4
×
5
4

=

25
16

③原式=-

16
3
÷
10
3

=-

16
3
×
3
10

=-

8
5

④原式=1.25÷0.5÷

5
8

=

5
4
×2×
8
5

=4;

⑤原式=18÷3.25÷2

1
4

=18×

4
13
×
4
9

=

32
13

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