已知a/2=b/3=c/5,求(3a+2b-2c)/(2a-b+c)的值.
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已知a/2=b/3=c/5,求(3a+2b-2c)/(2a-b+c)的值.
已知a/2=b/3=c/5,求(3a+2b-2c)/(2a-b+c)的值.
已知a/2=b/3=c/5,求(3a+2b-2c)/(2a-b+c)的值.
设a/2=b/3=c/5=k
则a=2k.b=3k,c=5k
(3a+2b-2c)/(2a-b+c)
=(6k+6k-10k)/(4k-3k+5k)
=2k/6k
=1/3