3x=8y 求(2x+3y)/(x-2y)
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3x=8y 求(2x+3y)/(x-2y)
x:y=8:3,设x=8t,y=3t,代入式子(2x+3y)/(x-2y)得,(2x+3y)/(x-2y)=(16t+9t)/(8t-6t)=12.5
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