(a-b)^5=?
(a+b)^5=?
(a-b)^5=?
(a+b)^5=?
(a-b)^5=a^5-5a^4b+10a^3b^2-10a^2b^3+5ab^4-b^5
(a+b)^5=a^5+5a^4b+10a^3b^2+10a^2b^3+5ab^4+b^5
=(a4+4a^3*b+6a^2*b^2+4ab^3+b^4)(a+b)=a^5+5a^4b+10a^3b^2+10a^2b^3+5ab^4+b^5
(a-b)^5=a^5-5a^4b+10a³b²-10a²b³+5ab^4-b^5