3⼀4+1⼀2-3⼀10简便 2⼀3-4⼀7+5⼀6简便 7⼀8-1⼀12+5⼀6简便

2025-03-16 08:50:12
推荐回答(1个)
回答1:

1,原式=5/4-3/10
=25/20-36/20
=19/20
2,原式=9/6-4/7
=63/42-24/42
=41/42
3,原式=21/24+20/24-1/12
=41/24-2/24
=39/24
=1又15/24