急救!!國中數學 x:y=4:7則(2X+3Y):(4X-Y)的比值 ~拜託教我算一下><!!感謝啦?

2018-05-11 10:51 pm

回答 (1)

2018-05-12 6:00 am
x:y=4:7則(2x+3y):(4x-y)的比值
Sol
x:y=4:7
x/4=y/7=t<>0
x=4t,y=7t
(2x+3y):(4x-y)
=(8t+21t):(16t-7t)
=29t:9t
=29:9


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