1-2+3-4+5-6+...+101-102+103
1-2+3-4+5-6+...+101-102+103
1
1-2+3-4+5-6+...+101-102+103
(1-2+3-4+5-6+7-8+...+101-102+103) * x-120=2012
tính nhanh
a, 1-2+3-4+5-6+......+101-102+103
b, 2-4+6-8+10-21+.....+98-100+102
c, 16-18+20-22+.....+64-66+68
Hepl me!Giải ra nhé!Ai giải ra mk tick 3 lần.Hứa
1-2+3-4+5-6+......+101-102+103
tính nhanh tổng sau:
a, 5 + 10 + 15 + 20 + ....... + 295 + 300
b, 1 - 2 + 3 - 4 + 5 - 6 + .......+ 101 - 102 + 103
c, 16 - 18 + 20 - 22 + 24 - 26 + ........+ 64 - 66 + 68
1-1/2-2+2/3+3-3/4-4+4/5+5-5/6-...-100/101+101+101/102
1 + 2 + 3 + 4 ..... 99 + 100 + 101 + 102 +103 + 104 ..... 189 + 199 = ?
