Tuyển Cộng tác viên Hoc24 nhiệm kì 26 tại đây: https://forms.gle/dK3zGK3LHFrgvTkJ6
cho a bang 2^2+2^3+...+2^20 chung minh rang A+4 khong phai la so chinh phuong
chund minh rang 1+3+32+33+...+361+362 khong la so chinh phuong
a, so co tong cac chu so la 2004 khong la so chinh phuong
b, so co tong cac chu so la 2006 khong la so chinh phuong
c, n = 20044+20043+20042+23 khong la so chinh phuong
cho S=1+3^1+3^2+3^3+...........+3^28+3^29+3^30
CMR:S khong phai la so chinh phuong
Cho A = 2^2 + 2^3 + 2 ^4 + ..... + 2^10. CMR : A + 4 khong phai la so chinh phuong.
hay chung minh rang A la so chinh phuong biet rang :A =1^3 + 2^3 + 3^3 + 4^3
So chinh phuong la so bang binh phuong cua mot so tu nhien ( vi du : 0,1,4,9,16,..) moi tong sau co la mot so chinh phuong khong?
a) 13 + 23
b) 13 + 23 33
C) 13 + 23 + 33 + 43
NHO GHI KET QUA GIUP MINH NHA CAM ON
cho A =3+3^2+.........+3^2004
chung minh A chia het cho 130
A co phai la so chinh phuong hay khong
lam cu the nhe
cho A=2*3*5*7*9*......*Pn la tich cua aso nguyen to dau tien. Chung to rang 3 so A-1;A;A+1 KHONG CO SO NAO LA SO CHINH PHUONG
