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x:1/2=2.75:3/8解比例

x:3/8=1/3:1/2解比例、 x:3/8=1/3:1/2 (1/2)x=1/3X3/8 (1/2)x=1/8 x=1/4

x:2/7=2/3:8/9 6x/9=4/21 6x=4x9/21 x=4x3/(7x6) x=2/7

(1)x=1/6 (2)x=1.6 (3)x=3 (4)x=36

这么简单

3:2/3x=9:8解比例 解: 2/3x×9=3×8 6x=24 x=4

8(9.6-x)=51.2 9.6-x=6.4 x=3.2

1/10:1/8=x:1/3 x/8=1/10×1/3 x=8×1/30 x=4/15

:即相当于➗号 ∴ x:7/8=2/3:4/3 => x * 8/7 = 2/3 * 3/4 => x * 8/7 = 1/2 =>16 * x = 7 => x = 7/16

(x+2):3/4=24:1/8 x+2=3/4x24÷1/8 x+2=144 x=144-2 x=142

(1)9:3.6= :x 9x= ×3.6 x= (2) =0.8:0.3 0.8x=0.24×0.3 x=0.09