计算:2(x+1)+x(x+2)-(x-1)(x+5)
问题描述:
计算:2(x+1)+x(x+2)-(x-1)(x+5)
答
2(x+1)+x(x+2)-(x-1)(x+5)
=2x+2+x²+2x-(x²+5x-x-5)
=x²+4x+2-x²-4x+5
=7