(1)x/4=5/48
解得x=4*5/48=5/12
(2)1/4:x=1/8:1/10
解得x=(1/4)*(1/10)/(1/8)
x=1/5
(3)x/5=30/3
解得x=30*5/3
x=50
(4)3/4:1/8=x/2
解得x=(3/4)*2/(1/8)
x=12
(5)6.5:x=3.25:4
解得x=4*6.5/3.25
x=8
(1)x/4=5/48
解得x=4*5/48=5/12
(2)1/4:x=1/8:1/10
解得x=(1/4)*(1/10)/(1/8)
x=1/5
(3)x/5=30/3
解得x=30*5/3
x=50
(4)3/4:1/8=x/2
解得x=(3/4)*2/(1/8)
x=12
(5)6.5:x=3.25:4
解得x=4*6.5/3.25
x=8