a, 499500
b, 1013022
c, 250901
d, 1080
sai thì thôi nhé
a) S = 1 + 2 + 3 + .... + 999
S =999 x 1000 : 2
S = 499500
Tính tổng
A, S=1+4+7+...+79. B, S=15+17+19+21+...+151+153
C,S=1+2+3+...+999. D,S=10+12+14+....+2022
E,S = 21+23+25+...+1001. G,S =24+25+26+...+125+126
Bài 1: Tính tổng:
a) S1= 1 + 2 + 3 +...+ 999
b) S2= 10 + 12 + 14 +...+ 2010
c) S3= 21 + 23 + 25 +...+ 1001
d) S4= 24 + 25 + 26 +...+ 125 + 126
e) S5= 1 + 4 + 7 +...+ 79
f) S6= 15 + 17 + 19 + 21 +...+ 151 + 153 + 155
g) S7= 15 + 25 + 35 +...+ 115
Tính tổng:
a) S1=1+2+3+...+999
b) S2=10+12+14+...+2010
c) S3=21+23+25+...+1001
d) S4=24+25+26+...+125+126
e) S5=1+4+7+...+79
f) S6=15+17+19+21+...+151+153+155
g) S7=15+25+35+...+115
Bài 6 : Tính tổng
a ) S1 = 1 +2 +3 +4 +.....+ 999
b ) S2 = 10 + 12 + 14 + .....+ 2010
c ) S3 = 21 + 23 + 25 +.....+ 1001
d) S5 = 1 + 4 + 7 +....+ 79
e ) S6 = 15 + 25 + 35 +...+ 115
Giúp nha các bạn
1) 4 - ( 7 - x ) = x - ( 13 - 4
2) a) S1 = 1 + 2 + 3 + ... + 999
b) S2 = 10 + 12 + 14 + ... + 2010
c) S3 = 1 + 4 + 7 + ... + 79
d) S4 = 15 + 17 + 19 + 21 + ... + 151 + 153 + 155
e) S5 = 15 + 25 + 35 + ... + 115
f) S6 = 21 + 23 + 25 + ... + 1001
g) S7 = 24 + 25 + 26 + ... + 125 + 126
a , S1 = 1 + 2 + 3 + ....... + 999
b , S2 = 10 + 12 + 14 + ...... + 2010
c , S3 = 21 + 23 + 25 + ..... + 1001
d , S4 = 24 + 25 + 26 + ........ + 125 + 126
e , S5 = 1 + 4 + 7 + ..... + 79
f , S6 = 15 + 17 + 19 + 21 + .... + 151 + 153 + 155
g , S7 = 15 + 25 + 35 + .... + 115
1. Tính tổng
a. S1=1+2+3+4+....+999
b. S2=10+12+14+...+2010
c. S3=21+23+25+...+1001
a) S1 = 1 + 2 + 3 +…+ 999
b) S2 = 10 + 12 + 14 + … + 2010
c) S3 = 21 + 23 + 25 + … + 1001
d) S4 = 24 + 25 + 26 + … + 125 + 126
e) S5 = 1 + 4 + 7 + …+79
Bài 1 : Tính tổng
a) S1= 1+2+3+....+999 d) S4=1+4+7=.....+79 g) S7=24+25+26+.....+125+126
b) S2=10+12+14+.....+2010 e) S5=15+17+19+21+.....+151+153+155
c) S3=21+23+25+......+1001 f) S6=15+25+26+.....+125+126
