(2x+1)的平方
(2x +1)的平方-(x +3)的平方-(x-1)的平方 +1最好有详细过程.多谢!
(2x+1)^2-(x+3)^2-(x-1)^2+1 解:原式=4x^2+4x+1-(x^2+6x+9)-(x^2-2x+1)+1 =4x^2+4x+1-x^2-6x-9-x^2+2x-1+1 =4x^2-x^2-x^2+4x-6x+2x+1-9-1+1 =2x^2-8