Question

怎样简便就怎样计算

怎样简便就怎样计算。
1/7+5.4+6/7 9+1/4-（1/4+5/6） 5/6+4/5-11/15 1/6+3/4-8/9 2+3/7+7/9-（2+3/7-1/9)
= = = = =
= = = = =
4/5-(0.625-1/5) 2/19+2/19+2/19+2/19+2/19+2/19 1/27+2/27+3/27+……+26/27
= = =
= = =

Answer 1

1/7+5.4+6/7
=1/7+6/7+5.4
=1+5.4
=6.4

9+1/4-（1/4+5/6）
=9+（1/4-1/4）-5/6
=9-5/6
=8又1/6

5/6+4/5-11/15
=5/6+（4/5-11/15）
=5/6+1/15
=9/10

1/6+3/4-8/9
=11/12-8/9
=1/36

2+3/7+7/9-（2+3/7-1/9)
=（2-2）+（3/7-3/7）+（7/9+1/9）
=0+0+8/9
=8/9

4/5-(0.625-1/5)
=4/5+1/5-0.625
=1-0.625
=0.375

2/19+2/19+2/19+2/19+2/19+2/19
=2/19×6
=12/19

1/27+2/27+3/27+……+26/27
=（1/27+26/27）×26÷2
=1×26÷2
=13

Answer 2

1/7+5.4+6/7=6/7+1/7+5.4=1+5.4=6.4
9+1/4-（1/4+5/6）= 9+1/4-1/4-5/6=9-5/6=49/6
5/6+4/5-11/15=25/30+24/30-22/30=9/10
1/6+3/4-8/9=6/36+27/36-32/36=1/36
2+3/7+7/9-（2+3/7-1/9)=2+3/7+7/9-2-3/7+1/9=0+0+8/9=8/9
4/5-(0.625-1/5)=4/5-5/8+1/5=3/8
2/19+2/19+2/19+2/19+2/19+2/19=2×6/19=12/19
1/27+2/27+3/27+……+26/27= (1+2+3+4……+26)/27=((1+26)×26÷2)/27=13

Answer 3

1/7+5.4+6/7
=1/7+6/7+5.4
=1+5.4
=6.4

9+1/4-（1/4+5/6）
=9+（1/4-1/4）-5/6
=9-5/6
=8/1/6

5/6+4/5-11/15
=5/6+（4/5-11/15）
=5/6+1/15
=9/10

1/6+3/4-8/9
=11/12-8/9
=1/36

2+3/7+7/9-（2+3/7-1/9)
=（2-2）+（3/7-3/7）+（7/9+1/9）
=0+0+8/9
=8/9

4/5-(0.625-1/5)
=4/5+1/5-0.625
=1-0.625
=0.375

2/19+2/19+2/19+2/19+2/19+2/19
=2/19×6
=12/19
1/27+2/27+3/27+……+26/27
=（1/27+26/27）×26÷2
=1×26÷2
=13