求未知数x (12%) (1)3:8 = x:2.4 (2)x:5 = :0.5 (3) :x = 6

问题描述:

求未知数x (12%) (1)3:8 = x:2.4 (2)x:5 = :0.5 (3) :x = 6

(1)3:8 = x:2.4
8x=3×2.4
x=3×2.4÷8
x=0.9
后面两道题题目不完整