已知a/2=b/3=c/4,求(a+2b+3c)/(a-2b-3c)
人气：437 ℃ 时间：2020-05-23 16:54:16
解答
a/2=b/3=c/4
b=3/2a
c=2a
(a+2b+3c)/(a-2b-3c)
=(a+3a+6a)/(a-3a-6a)
=10a/-8a
=-5/4
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