x:16=5:

问题描述:

x:16=5:

20/3

x : 16 = 5 : 12
12x = 5×16
12x = 80
x = 80÷12
x = 20/3

外项积等于内项积
所以12x=16×5
12x=80
x=80÷12
x=20/3