x:8=3/4:1又1/5

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x:8=3/4:1又1/5x:8=3/4:1又1/5x:8=3/4:1又1/5x:8=3/4:1又1/5x=3/4x8÷6/5x=6÷6/5x=5x:8=3/4:1又1/5x:8=5:88x=8*5x

x:8=3/4:1又1/5
x:8=3/4:1又1/5

x:8=3/4:1又1/5
x:8=3/4:1又1/5
x=3/4x8÷6/5
x=6÷6/5
x=5

x:8=3/4:1又1/5
x:8=5:8
8x=8*5
x=8*5÷8
x=5

x:8=3/4:1又1/5
x:8=3/4:6/5
6x/5=8×3/4
6x/5=6
6x=30
x=5

解由x:8=3/4:1又1/5
得6/5×x=8×3/4
即6/5×x=6
即x=6÷6/5=6×5/6
即x=5.