[질문] 곱셈공식의변형공식좀알려주세요

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