x=3k,y=4k,z=5k
4x+2y-5z/3x+4y-7z
=12k+8k-25k/9k+16k-35k
=-5k/-10k
=1/2
已知x/3=y/4=z/5≠0,求4x+2y-5z/3x+4y-7z的值
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