解:9:0.02的比值是( 450:1 ) ∵已知需求出9:0.02的比值是多少 X : Y = X ÷ Y = Z ∴9:0.02 = 9 ÷ 0.02 = 9 ÷ 2/100 = 9 ÷ 1/50 = 9 × 50 = 450 ∴9:0.02 = 450 = 450:1 答:9:0.02的比值是450:1