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若x/3=y/5=z/7,则x-y+z/x+y-z等于多少
题目详情
若x/3=y/5=z/7,则x-y+z/x+y-z等于多少
▼优质解答
答案和解析
设x/3=y/5=z/7=k
则 x=3k,y=5k,z=7k
x-y+z/x+y-z
=(3k-5y+7k)/(3k+5k-7k)
=(5k)/(1k)
=5
则 x=3k,y=5k,z=7k
x-y+z/x+y-z
=(3k-5y+7k)/(3k+5k-7k)
=(5k)/(1k)
=5
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