若4X-5Y=0,且Y不等于0,求(12X-5Y)/(12X+5Y)的值

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若4X-5Y=0,且Y不等于0,求(12X-5Y)/(12X+5Y)的值
若4X-5Y=0,且Y不等于0,求(12X-5Y)/(12X+5Y)的值

若4X-5Y=0,且Y不等于0,求(12X-5Y)/(12X+5Y)的值
4X-5Y=0,4x=5y
(12X-5Y)/(12X+5Y),
={(12x-4x)/(12x+4x)
=8x/16x
=1/2

4X-5Y=0,则 X=5/4Y
(12X-5Y)/(12X+5Y)
=[12*(5/4X)-5Y]/[12*(5/4X)+5Y]
=(15Y-5Y)/(15Y+5Y)
=(10Y)/(20Y)
=1/2

1/2
假设x=5,y=4
(60-20)/(60+20)=1/2