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

求未知數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
後面兩道題題目不完整