1,27+2,77+4,27+5,77+.....+31 27=32,77
N = 1,27 + 2,77 + 4,27 + 5,77 +...+ 14,77
mong mn giúp đỡ
tin nhanh 1,27+2,77+ 4,27+5,77+7,27,,,,,,,,,,,,,,,+13.27+14.77
1,27+2,77+4,27+5,77+7,27+8,77+10,27+11,77+13,27+14,77
1,27+2,77+4,27+5,77+8,27+10,27+11,77+13,27+14,77+7,27
Tình nhanh
1,27+2,77+4,27+5,77+2,27+8,77+10,27+11,77+13,27+14,77
a)1,27+2,77+4,27+5,77+...+31,27+32,77
b)3,63+5,13+6,63+8,13+...+41,13+42,63
1,27 + 2,77 + 4,27 + 5,77 + 7,27 + 8,77 + 10,27 + 11,77 + 13,27 + 14,77