\(2^2+4^2+6^2+...+24^2=2^2.\left(1^2+2^2+3^2+...+12^2\right)\)
\(2^2+4^2+6^2+...+24^2=2^2.\left(1^2+2^2+3^2+...+12^2\right)\)
tinh nhanh
S= 1+2+2^2+2^3+....+2^52+2^5
giup minh nhe!
Tinh nhanh :
1^2 +2^2 +3^2 +...+100^2
Giup minh voi nhe
cho a =1/2^2 +1/2^3 +1/2^4+.....+1/2^100 c/m A khong phai la so tu nhien
CAC BAN GIUP MINH GIAI NHE! AI GIAI DUNG MINH TICH CHO
b) Viet tich sau duoi dang mot luy thua :
2 . 2 . 2 . 3 .3 . 62 . 3
c) Tinh 27 . 75 . +25 . 27 - 150
Ai biet giai giup minh voi nhe!
1.tinh
C=(1+1/1.3)(1+1/2.4)(1+1/3.5)...(1+1/2014.2016)
2.tim x
a,5^x=125
b,3^2.x=81
c,5^2.x-3-2=10
d,(5^x-1).3-2=10
3.tim n de n^2+2016 la 1 so chinh phuong
Giai nhanh giup minh nhung phai co phep tinh ,loi giai duong hoang nhe!!!!!
ta co 1*2+2*3+3*....+38 *39+39*40
giai nhanh giup minh nhe
Tinh nhanh:
m)5^1+5^2+5^3+...+5^199+5^200
n)3^0-3^2+3^3-3^4+...+3^2017-3^2018+3^2019-3^2020
o)6+6*9+6*9^2+6*9^3+...+6*9^99
p)(-1)*(-1^2)*(-1^3)*(-1^4)*...*(-1^99)*-(1^100)
Giup minh nhe!
1.chung minh rang
A=2+2^2+2^3+...+2^30 chia het cho 7
2.chung minh rang neu p la so nguyen to lon hon 3 thi p^2-1chia het cho 24
giai nhanh ho minh nhe!
H=2+2^2+2^3+2^4+...+2^100
giai giup minh nhe! xin cam on truoc