若x+y+z不等于0,且x/(y+z)=y/(z+x)=z/(x+y),求x/(x+y+z)的值大神们帮帮忙
题目
若x+y+z不等于0,且x/(y+z)=y/(z+x)=z/(x+y),求x/(x+y+z)的值大神们帮帮忙
答案
x/(y+z)=y/(z+x)=z/(x+y), 所以(x+y+z)/(y+z+z+x+x+y)=x/(y+z) (x+y+z)/(2x+2y+2z)=x/(y+z) 1/2=x/(y+z) y+z=2x x/(x+y+z) =x/(x+2x) =1/3
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