2H=22+23+24+...+2101
2H-H=2+101=>H=2+2101
H = 2 + 22 + 23 + 24 + ... + 2100
2H = 22 + 23 + 24 + 25 + ... + 2101
2H - H = (22 + 23 + 24 + 25 + ... + 2101) - (2 + 22 + 23 + 24 + ... + 2100)
H = 2101 - 2
(x-1).(x+2).(x-3)=0
ai giup minh thi nhanh len nhe minh cam on truoc
cac ban giup minh nhe:
1+2+2^2+...+2^2008/1-2^2008
cam on cac ban da giup minh
Tìm x là stn
6x : 33 :4 = 2
3.(x-5)3=81
7x - 2x=617: 615+ 38 : 26
Giup minh vơi a , co cach lam nhe a
Cam on
M=(5^9+5^8+5^7).(3^6+3^5+3^4+3^3+3^2+3) chung minh chia het cho 2015
giup minh giai ra nhe cam on
M=2+2^3+2^4+2^5+2^6+2^7+...+2^98+2^99+2^100 co chia het cho 14 khong
giai ra giup luon nhe cam on
tim so tu nhien x,y sao cho:x /9 -3 / y = 1 / 18
cho A= 1/1^2 + 1/2^2+1/3^2 1/4^2+...+1/50^2. chung minhA<2
tinh tong S=3+3/2+3/2^2+...3/2^9
ban nao giup voi nhe to can on truoc
2 chu so tan cung cua 14^101?
tra loi giup minh nhe ! cam on nhiu lam nghen
SO SANH
a) 8192 va 818 . 820
b) 142 va 112+32
c)152-132 va 22
LAM ON GIUP MINH NHE. CAM ON!
tim x biet : (11/12+11/12.23+11/23.24+...+11/89.100) + x = 2/3
giup minh voi minh dang can gap xin cam on nhieu