Question

这些题怎么做，老师帮帮忙啊！明天要注册了。

Answer 1

0.5+3/4-1/2
=1/2-1/2+3/4
=3/4

2/7+5/6-1/6
=2/7+4/6
=2/7+2/3
=6/21+14/21
=20/21

6又10/11-3+1又1/11
=6+10/11+1+1/11-3
=8-3
=5

2/5+1/8+7/8
=2/5+1
=1又2/5

1又17/40+5又5/9+23/40
=1+17/40+5+5/9+23/40
=1+1+5+5/9
=7又5/9

9+3/7+4/7
=9+1
=10

1/6+3/4+1/3
=2/12+9/12+4/12
=15/12
=1又1/4

1-7/9-2/9
=1-1
=0

4又8/25<4又4/5 2又1/8=2又3/24 5/12>7/48
7/22<6/11 2/3>3/5 1/9>1/10 3/8>1/7