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

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

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

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
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