用简便方法计算下列各题 5⼀3+4⼀1+5⼀2 12⼀11-(6⼀1-12⼀1)

2024-12-26 14:24:06
推荐回答(2个)
回答1:

3/5+1/4+2/5
=(3/5+2/5)+1/4
=1+1/4
=1又1/4
11/12-(1/6-1/12)
=11/12+1/12-1/6
=1-1/6
=5/6
3/7+(5/6+4/7)
=3/7+4/7+5/6
=1+5/6
=1又5/6
9/5-(9/4+10/1)
5/9-(4/9+1/10)
=5/9-4/9-1/10
=1/9-1/10
=1/90
9/16+3/8+7/16+1/8
=(9/16+7/16)+(3/8+1/8)
=1+1/2
=1又1/2
4/9+3/5+5/9+1/2

=(4/9+5/9)+(3/5+1/2)
=1+11/10
=2又1/10

回答2:

应是分子与分母反了