Question

帮忙，初一数学题。

有理数加减乘除法计算。
1.7.2-(4.8)
2.(-31/2)-51/4
3.(-3)×5/6×(-9/5)×(-1/4)
4.(-2/3)×(-8/5)÷(-0.25)
5.42 7/11÷7

五道题，请大家帮帮忙，不一定全部对！
过程过程。

Answer 1

1.7.2-(4.8)
=7.2-4.8
=2.4

2.(-31/2)-51/4=-113/4

3.(-3)×5/6×(-9/5)×(-1/4)
=-3×5/6×9/5×1/4
=-9/8

4.(-2/3)×(-8/5)÷(-0.25)
=-2/3×8/5×4
=-64/15

5.42 7/11÷7=61/11

Answer 2

1.7.2-(4.8)=2.4

2.(-31/2)-51/4
=-62/4-51/4
=-(62+51)/4
=-113/4

3.(-3)×5/6×(-9/5)×(-1/4)
=-3×5/6×9/5×1/4
=-9/8

4.(-2/3)×(-8/5)÷(-0.25)
=-2/3×8/5×4
=-64/15

5.42 7/11÷7
=427/11x1/7
=61/11

Answer 3

1.2.4
2.-113/4
3.-9/8
4.-64/15
5.6 1/11

不是坑人吧？

Answer 4

①2.4
②-113/4
③-9/8
④-64/15
⑤61/11

Answer 5

①2.4
②113/2
③－9/8
④－64/15
⑤61/11

Answer 6

2.4
-113/4
-9/8
64/15
61/11