Question

a平方加ab加b平方分之a-b等于M分之a三次方减b三次方,则M为几

Answer 1

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

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