化简(x+1)(x-2)+(x-3)的2次方-x(x-5)
问题描述:
化简(x+1)(x-2)+(x-3)的2次方-x(x-5)
答
(x+1)(x-2)+(x-3)的2次方-x(x-5)
=x²+x-2x-2+x²-6x+9-x²+5x
=x²-2x+7