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sang dan 2 lan, tat dan 3lan 8 led portB

vinh S=1/1!-1/2!+1/3!+...+(-1)^(n+1)*1/n!;

vinh S=1^k+2^k+....+n^k

vinh dan so the gioi

cau truc

den len tu o den 99

sang dan, tat dan 2 portb, portd

may cat got kl

doa 2620

vinh can phai