Question

a三次方加b三次方减a的平方b减b的平方a

Answer 1

a^3+b^3-a^2b-b^2a

=(a^3+b^3)-(a^2b+ab^2)

=(a+b)(a^2-ab+b^2)-ab(a+b)

=(a+b)(a^2-ab+b^2-ab)

=(a+b)(a-b)^2