0.35:4.2=X:30
问题描述：
0.35:4.2=X:30
8/1：6/1=10/1：X 和4.4：X=2.75：0.75谢
答
0.35 :4.2 = x :30
x = 0.35×30/4.2 = 10.5/4.2 = 2.5
1/8 :1/6 = 1/10 :x
x =( 1/6× 1/10 )/ (1/8) = (1/60) / (1/8) = 1/60 × 8 = 2/15
4.4 ：x = 2.75 ：0.75
x = 4.4 × 0.75 / 2.75 = 3.3 / 2.75 = 1.2