5:8=x:16解x 0.3/1.5=4.2/x 5/3:x=2:3/2

问题描述:

5:8=x:16解x 0.3/1.5=4.2/x 5/3:x=2:3/2

1)5:8=x:16
8x =80
x=10
2) 0.3/1.5=4.2/x
0.3x=6.3
x=2.1
3) 5/3:x=2:3/2
2x=5/2
x=5/4