Các câu hỏi tương tự
2^3+3^3+4^3+...+20^3=? Giup minh giai bai nay nhe giai thich cach lam nhe cac ban
Cac ban giai giup minh bai nay voi
a 1+(-3)+2+(-4)+3+(-5)+...+98+(-100)
b 1+(-5)+2+(-6)+3+(-7)+...+99+(-103)
hay van dung ket qua phan a ma cac ban vua lam ra la A<1/2
chung to 1/3+2/3^3+3/3^3+4/3^4+...+100/3^100<3/4
bai 1 :
1) ( -213) + 186 + ( - 14 ) + 217 + 54 + ( - 49 )
2 ) - 38 . ( 25 - 4 ) + 25 . ( -4 + 38 )
3) -39 . ( 5 - 99 ) + 99 . ( 10 - 39 )
4 ) 1+ 3-5-7+9+ 11 - ....- 397 - 399
5) 1+ 2 + 2^2 + ... + 2 ^ 100
6) 3^102 - 3 ^ 100 - 3 ^ 98 -...3 ^2 - 3 ^0
cam phien cac ban lam giup minh nha
Tim x biet :
(x + 1) + (x + 2) + (x + 3 )+ ... + (x + 20) = 250
BAI NAY LA BAI SAO DO CAC BAN MINH KHONG BIET LAM CAC BAN GIUP MINH VOI
1/3+2/32+3/33+.....100/3100
Cac ban giai giup minh bai ne nghen.Thank you
A = 31 + 34+ 37+ ...+ 3100
Chung minh A chia het cho 8
Cac ban oi giup minh nha minh can gap lam luon y,neu ai la GV thi giup em nha !
100-99+98-97+...+4-3+2-1
Mong cac ban giup minh, minh dang can gap lam
C=3+(3/1+2)+(3/1+2+3)+(3/1+2+3+4)+...+(3/1+2+3+...+100)
minh dang can gap mong cac ban giup minh T_T