4y²-4y/y²-2y+1÷(y+1/y-1-y-1/y+1)÷(3y+3)

问题描述:

4y²-4y/y²-2y+1÷(y+1/y-1-y-1/y+1)÷(3y+3)

4y²-4y/y²-2y+1÷(y+1/y-1-y-1/y+1)÷(3y+3)
=4y(y-1)/y(y-2)÷【(y+1)²-(y-1)²】/(y+1)(y-1)÷3(y+1)
=4(y-1)²/3(y-2)÷4y
=(y-1)²/3y(y-2)
如果本题有什么不明白可以追问,