Rút gọn các biểu thức x+1/x+2:(x+2/x+3:x+3/x+1)

x+1x+2:x+2x+3:x+3x+1=x+1x+2:x+2x+3.x+1x+3=x+1x+2:x+2x+3.x+1x+3=x+1x+2:x+2.x+1x+32=x+1x+2.x+32x+2.x+1=x+32x+22