S4=15+17+19+21+....+151+153+155
s5=15+17+19+21+...+151+153+155
D= 24+25+26+...+125+126
F= 15+17+19+21+...+151+153+155
G=15+25+35+...+115
tính Tổng : S= 15+17-19-21+23+25-27-29+...+151+153-155
tinh tong
S=1+2+3+...+500
A=10+12+14+...+2020
D=21+23+25+...+1001
F=15+17+19+21+...+151+153+155
Bài 5*. Tính tổng:
S1 = 1 + 2 + 3 + …+ 999
S2 = 21 + 23 + 25 + … + 1001
S3 = 23 + 24 + … + 127 + 128
S4 = 15 + 17 + 19 + 21 + … + 151 + 153 + 155
tinh tong
S=1+2+3+...+999
S=15+17+19+21+...+151+153+155
Tinh tong
A = 1 +2+3+...+999
B=21+23+25+...+1001
C=23+24+...+1001
D=15+17+19+21+...+151+153+155
tính tổng
a,S=15+17+19+21+..................+151+153+155
b,S=15+25+35+...............................+115
c,S=24+25+26+.........................+125+126