解比例
(1)1/2:1/3=1/4:x
x=1/4x2/3
=1/6
(2)0.8:4=x:8
x=8x0.2
=1.6
(3)3/4:x=3:12
x=3/4X12/3
=3
(4)2/9=8/x
x=8X9/2
=36
(1)x=1/6
(2)x=1.6
(3)x=3
(4)x=36
x=6