因为:b=2/3a c=1/2a 2a=3b=4c
所以:(a+2b+3c)/(2a+3b+4c)=(a+2/3a+1/2a)/(2a+2a+2a)
=(23/6a)/6a
=(23/6)/6
=23/36
希望你还来得及.