B=2+2^2+2^3+...+2^60
B=(2+2^2)+(2^3+2^4)....(2^59+2^60)
B=2.(1+2)+2^3.(1+2)+.....+2^59.(1+2)
B=2.3+2^3.3+.....+2^59.3
B=3.(2+2^3+.....+2^59) chia hết cho 3
B=2+2^2+2^3+...+2^60
B=(2+2^2+2^3)+.....+(2^58+2^59+2^60)
B=2.(1+2+2^2)+......+2^58.(1+2+2^2)
B=2.7+.....+2^58.7
B=7.(2+....+2^58) chia hết cho 7
B=2+2^2+2^3+...+2^60
B=(2+2^2+2^3+2^4)+......+(2^57+2^58+2^59+2^60)
B=2.(1+2+2^2+2^3)+.....+2^57.(1+2+2^2+2^3)
B=2.15+.....+2^57.15
B=15.(2+.....+2^57) chia hết cho 15
B=2+2^2+2^3+...+2^60
B=(2+2^2+2^3+2^4+2^5)+......+(2^56+2^57+2^58+2^59+2^60)
B=2.(1+2+2^2+2^2+2^3+2^4)+....+2^56.(1+2+2^2+2^2+2^3+2^4)
B=2.31+.......+2^56.31
B=31.(2+....+2^56) chia hết cho 31
B=2+2^2+2^3+...+2^60
B=(2+2^2+2^3+2^4+2^5+2^6+2^7+2^8+2^9+2^10+2^11)+......+(2^49+2^50+2^51+2^52+2^53+2^54+2^55+2^56+2^57+2^58+2^59+2^60)
B=2.(1+2+2^2+2^3+2^4+2^5+2^6+2^7+2^8+2^9+2^10+2^11)+....+2^49.(1+2+2^2+2^3+2^4+2^5+2^6+2^7+2^8+2^9+2^10+2^11)
B=2.4095+....+2^49.4095
B=4095.(2+...+2^49) chia hết cho 5 (Vì 4095 chia hết cho 5)
Mãi mới xong:M025::M025::M025::M025:bạn cứ giải thế này là ổn nghen
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