已知x/2=y/3=z/4,求x+y-z/x+y+z的值
1个回答
设x/2=y/3=z/4=k
∴x=2k,y=3k,z=4k
∴x+y-z/x+y+z
=(2k+3k-4k)/(2k+3k+4k)
=k/9k
=1/9
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