已知x/2=y/3=z/4,求x-2y+3z/x+y+z的值
3个回答
x/2=y/3=z/4=k,x=2k、y=3k、z=4k
(x-2y+3z)/(x+y+z)=(2k-6k+12k)/(2k+3k+4k)=8/9
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