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已知x/3=y/5=z/7不等于0,则2x+3y+4z/5x-3y+z=?
人气:479 ℃ 时间:2020-05-05 09:19:49
解答
x/3=y/5=z/7=k
x=3k,y=5k,z=7k
2x+3y+4z/5x-3y+z
=(6k+15k+28k)/(15k-15k+7k)
=7
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