Question

-3/4-1/2+2/7-4/5等于多少用分数表示

Answer 1

-3/4-1/2+2/7-4/5
=-(3/4+2/4.)+(10/35-28/35)
=-5/4-18/35
=-(175/140+72/140)
=-247/140
=-1又107/140

Answer 2

解：
原式=-3/4-1/2+2/7-4/5
=2/7-3/4-2/4-4/5
=2/7-5/4-4/5
=2/7-25/20-16/20
=2/7-41/20
=40/140-287/140
=-247/140
答：等于-247/140

Answer 3

-3/4-1/2+2/7-4/5
=-0.75-0.5+2/7-0.8
=2/7-1.25-0.8
=2/7-2.05
=-2-1/20+2/7
=-2+（40-7）/140
=-2+37/140
=-1-103/140
=-1又103/140

Answer 4

计算如下：

-3/4-1/2+2/7-4/5
=-3/4-2/4+2/7-4/5
=-5/4+2/7-4/5
=-5/4-4/5+2/7
=-25/20-16/20+2/7
=-41/20+2/7
=-287/140+40/140
=-247/140