3x=8y 求(2x+3y)/(x-2y)
问题描述:
3x=8y 求(2x+3y)/(x-2y)
答
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
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