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![](https://rs.olm.vn/images/avt/0.png?1311)
a=100+98+96+...+2-97-95-...-1
=100+(98-97)+(96-95)+...+(2-1)
=100+1+1+...+1
=100+1.50
=100+50=150
![](https://rs.olm.vn/images/avt/0.png?1311)
a, 8*17*125=(8*125)*17=1000*17=17000
b, 4*37*25=(4*25)*37=100*37=3700
![](https://rs.olm.vn/images/avt/0.png?1311)
1+2‐3‐4+5+6‐7‐8+9+10‐11‐12+...‐229‐300+301+302
= (1+2‐3)+(4+5+6‐70)+...+(228‐229‐300+301)+302
= 0 + 0 +...+ 0 + 302 = 302
![](https://rs.olm.vn/images/avt/0.png?1311)
B = 1+2-3-4+5+6-7-8+9+10-11-12+...-299-300+301+302( có 302 số, 302 chia 4 dư 2)
B = 1+(2-3-4+5)+(6-7-8+9)+(10-11-12+13)+...+(298-299-300+301)+302
B = 1 + 0 + 0 + 0 + ... + 0 + 302
B = 303 + 0
B = 303
1+2-3+5+6-7-8+...-399-400
Ta có
(1+2-3)+(-4+5+6-7)+(-8+9+10-11)+...
+(-396+396+398-399)-400
=0+0+0+...+0-400
=-400
![](https://rs.olm.vn/images/avt/0.png?1311)
B = 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + 10 - 11 - 12 + ... - 299 - 300 + 301 + 302 (có 302 số; 302 chia 4 dư 2)
B = 1 + (2 - 3 - 4 + 5) + (6 - 7 - 8 + 9) + (10 - 11 - 12 + 13) + ... + (298 - 299 - 300 + 301) + 302
B = 1 + 0 + 0 + 0 + ... + 302
B = 1 + 302
B = 303
![](https://rs.olm.vn/images/avt/0.png?1311)
1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + 10 - 11 - 12 +........- 299 -300 + 301 +302
Theo đề ta có:
Cho A= 1 + 2 - 3 - 4 + 5 + 6 - 7 - 8 + 9 + 10 - 11 - 12 +........- 299 -300 + 301 +302
=> 1 + (2 - 3 - 4 + 5 )+ (6 - 7 - 8 + 9) + (10 - 11 - 12 +13)........(289- 299 -300 + 301) +302
=> 1+ 0+ 0+.....+ 0+ 302
=> 1+302
=> 303
![](https://rs.olm.vn/images/avt/0.png?1311)
Ta chia thành: 1 + (2-3-4+5) + (6-7-8+9)+....+(298-299-300+301) + 302 = 1 + 0 + 0 + 0 + .....+ 0 + 302 = 1+302 = 303
**** cho mk nha bạn !!!
![](https://rs.olm.vn/images/avt/0.png?1311)
1+2-3-4+5+6-7-8+9+10-11-12+.....-299-300+301+302
=1+(2-3)+(-4+5)+(6-7)+(-8+9)+(10-11)+... +(-300+301)+302
= 1-1+1-1+1-1+...-1+302
= 302
Học tốt
@Trung
![](https://rs.olm.vn/images/avt/0.png?1311)
1+2-3-4+5+6-7-8+9+10-11-12+...+299-300+301+302
=1+(2-3-4+5)+(6-7-8+9)+(10-11-12+13)+...+(298-299-300+301)+302
=1+0+0+0+...+0+302
=1+302
=303
1+2-3-4+5+6-7-8+9+10-11-12+...-299-300+301+302
=(1+2-3)+(4+5+6-7)+...+(298-299-300+301)+302
= 0 + 0 +...+ 0 + 302
=302
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