若31.25:X:13.75=100:19.2:Y 则Y-X=
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若31.25:X:13.75=100:19.2:Y则Y-X=若31.25:X:13.75=100:19.2:Y则Y-X=若31.25:X:13.75=100:19.2:Y则Y-X=31.25/100=
若31.25:X:13.75=100:19.2:Y 则Y-X=
若31.25:X:13.75=100:19.2:Y 则Y-X=
若31.25:X:13.75=100:19.2:Y 则Y-X=
31.25/100=x/19.2=75/y
解之x=6 y=240
y-x=240-6=234
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若31.25:X:13.75=100:19.2:Y 则Y-X=
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