Tính tổng: S1=1+ 2+ 3+...+ 999
Bài 1:Tính tổng:
a)S1=1+2+3+...+999
b)S2=10+12+14+...+2010
c)S3=21+23+25+...+1001
d)S5=1+4+7+...+79
e)S6=15+17+19+21+...+151+153+155
f)S7=15+25+35+...+115
g)S4=24+25+26+...+125+126
giúp mk nha mai nộp rùi
a)S1=1+2+3+...+999
b)S2=10+12+14+...+2010
c)S3=21+23+25+...+1001
d)S5=1+4+7+...+79
e)S6=15+17+19+21+...+151+153+155
f)S7=15+25+35+...+115
g)S4=24+25+26+...+125+126
giúp mk nha mai nộp rùi