Question

已知(x＋y)/y＝3/2,那么(x－3y)/(x＋2y)＝?

Answer 1

已知(x＋y)/y＝3/2,

x/y+1=3/2

x/y=1/2

y=2x

那么(x－3y)/(x＋2y)

=(x-3×2x)/(x+2×2x)

=(-5x)/5x

=-1