PS:/为分数线1.若x/y=3/4,求(x+y)/y,x/(y-x),(x+y)/(y-x)2.已知x/2=y/3=z/4,求(x+y-2z)/2x-y3.已知k=2a/(b+c)=2b/(a+c)=2c/(a+b),求k的取值4.如图,点C`B在线段上,AD/DB=AC/CB,若AB=6cm,AC=3.6cm,求BD,AD图大概是这样的-----------------
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