①(x+y)/6+(x-y)/10=3,(x-3)/4-(y-3)/3=35/6.。②(x+1)/3-(y+2)/4=0,(x-3)/4-(y-2)/3=1/12。③x/3+y/2=1/2,5x+7y=6又5/6。④5x-2y=50,15%x+6%y=5。⑤(2x-y)/2+1=(x-y)/3,2x-3y=4