计算 2x^2-(3x-1)(1+3x)+5x(x-1)
问题描述:
计算 2x^2-(3x-1)(1+3x)+5x(x-1)
答
2x^2-(3x-1)(1+3x)+5x(x-1)
=2x^2-(9x^2-1)+5x^2-5x
=2x^2-9x^2+1+5x^2-5x
=-2x^2-5x+1