tinh tong 1 so len lam thu coi may thag ga !!! hahaha

lau lau ko len thay anh em mih dao nay luoi we de bot cag thag lan nay anh cho cac e 1 baj lam thu coi sao ha......
tinh tog A= 1^2 + 2^2 + ..........+ n^2
B= 1^3 + 2^3 +............+ n^3
ko choi ap dung may caj dang thuc mih da bit thu xay dung caj dang thuc coi dua nao lam dc tao baj lam su phu hehehehe.............