(x-1/2)虏(x虏+1/4)虏(x+1/2)虏过程要详细!急!虏是平方

Question

(x-1/2)虏(x虏+1/4)虏(x+1/2)虏 过程要详细!
急!
虏是平方

Answer 1

原式=x² -1/4 -[x² +1/4 x -x-1/4] =x² -1/4 - x² +3/4 x +1/4 =3/4 x