若x/3=y/4=z/5≠0,求2x+y+3z/3x-2y-z的值.
人气：175 ℃ 时间：2020-02-04 03:55:39
解答
令x/3=y/4=z/5≠0=k
x=3k,y=4k,z=5k
代入得
(2x+y+3z)/(3x-2y-z)
=(6+4+15)/(9-8-5)
=-25/4
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