=15:30
=1/2
=0.25:0.4
=25:40
=5/8
乘以6
=3:4
=3/4
1年前
共回答了1325个问题
=15/30
=1/2
=(1/4)/(2/5)
=(1/4)*(5/2)
=5/8
=(1/2)/(2/3)
=(1/2)*(3/2)
=3/4
1年前