5y²_(y_2)(3y+1)_2(y+1)(y-5)过程
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5y²_(y_2)(3y+1)_2(y+1)(y-5)过程5y²_(y_2)(3y+1)_2(y+1)(y-5)过程5y²_(y_2)(3y+1)_2(y+1)(y-5)
5y²_(y_2)(3y+1)_2(y+1)(y-5)过程
5y²_(y_2)(3y+1)_2(y+1)(y-5)过程
5y²_(y_2)(3y+1)_2(y+1)(y-5)过程
=5y²-(3y²-5y-2)-2(y²-4y-5)=13y+12