6⼀7×5⼀9+4⼀9×6⼀7(简便计算) 0.8-(2⼀3+1⼀12)×8⼀9 5⼀6÷(6-5⼀12-7⼀12

2024-12-03 01:33:45
推荐回答(1个)
回答1:

简便计算

6/7×5/9+4/9×6/7
=6/7x(5/9+4/9)
=6/7x1
=6/7

0.8-(2/3+1/12)×8/9
=4/5-2/3x8/9-1/12x8/9
=4/5-16/27-2/27
=4/5-2/3
=2/15

5/6÷(6-5/12-7/12)

=5/6÷(6-1)
=5/6÷5
=1/6