(x+1)/2=(y+3)/42(x+1)=y+32x+2=y+32x=y+1y=2x-1(x+1)/2=(x+y)/5 5(x+1)=2(x+y) 5(x+1)=2(x+2x-1) 5x+5=2(3x-1) 5x+5=6x-2 6x-5x=5+2 x=7y=2x-1=2*7-1=13所以x=7,y=13