lwtchy
幼苗
共回答了21个问题采纳率:95.2% 举报
(1)原式
=7/12+3/10
=35/60+18/60
=53/60
(2)原式
=3/16-5/32
=6/32-5/32
=1/32
(3)原式
=19/20-11/12
=57/60-55/60
=2/60
=1/30
(4)原式
=(10/12-9/12)÷3/10
=1/12×10/3
=5/18
(5)原式
=5/12+3/10×7/6
=25/60+21/60
=46/60
=23/30
(6)原式
=11/28×14/11+5/6
=1/2+5/6
=一又三分之一
(7)原式
=(1/2+2/7)×7/8
=11/14×7/8
=11/16
(8)原式
=5/9÷[5/14×7/9]
=5/9÷5/18
=5/9×18/5
=2
1年前
2