(y-3)的平方-2(y+2)(y-2)计算、

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(y-3)的平方-2(y+2)(y-2)计算、(y-3)的平方-2(y+2)(y-2)计算、(y-3)的平方-2(y+2)(y-2)计算、(y-3)的平方-2(y+2)(y-2)=y的平方-6y+9-

(y-3)的平方-2(y+2)(y-2)计算、
(y-3)的平方-2(y+2)(y-2)计算、

(y-3)的平方-2(y+2)(y-2)计算、
(y-3)的平方-2(y+2)(y-2)
=y的平方-6y+9-2(y的平方-4)
=y的平方-6y+9-2y的平方+8
=-y的平方-6y+17

(y-3)^2-2(y+2)(y-2)
=y^2-6y+9-2(y^2-4)
=y^2-6y+9-2y^2+8
=-y^2-6y+17

(y-3)^2-2(y+2)(y-2)
=y^2-6y+9-2(y^2-4)
=y^2-6y+9-2y^2+8
=-y^2-6y+17