x=2y/3 (4y/3+y-1)/2=(-y/3)/34y+3y-3=-2y/37y-3=-2y/321y-9=-2yy=9/23
x:y=2:3,2y=3x,y=3x/2(2x+y-1)/2=(x-y)/3,(2x+3x/2-1)*3=2x-3x21x/2-3+x=0x=2/23y=3/23
x:y=2:3可得 y=3/2*x 带入2分之2x+y-1=3分之x-y,可得x=6/23 y=9/23