Question

初中数学,因式分解1.1-xy(1-xy)-x^3y^32.ab(c+d)(c-d)+cd(a+b)(a-b)3.x^3

Answer 1

1-xy(1-xy)-x^3y^3

=(1-xy)(1+xy+x^2y^2)-xy(1-xy)

=(1-xy)(1+xy)^2

ab(c+d)(c-d)+cd(a+b)(a-b)

=ac(bc+ad)-bd(bc+ad)

=(ad-bd)(bc+ad)