Question

因式分解的填空题(x+y)^2=_______;(a-b)^3=_______分解因式：x^3-x=____若x^2+2

Answer 1

x^2+2xy+y^2;a^3-3a^2b+3ab^2-b^3

x(x-1)(x+1)

m-3=±4→m=-1,m=7

x^3y+xy^3=xy(x^2+y^2)=xy[(x+y)^2-2xy]=-2[0^2-(-2)*(-2)]=-8