Question

已知(y+m)/(x)=(m+x)/(y)=(x+y)/(m),求(m)/(x+y)的值

Answer 1

1/2时,你是将三式分子分母相加得到的,注意分母不能为0,x,y,m,都不为0,但可能X+Y+M=0,此时m/(x+y)=-1