gup minh minh k cho nha
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gup minh minh k cho 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=3+3^2+3^3+3^4+...+3^100
a, tinh gia tri cua A
b, Chung to A chia het cho 10
c, tim so du cua A khi chia cho 13
d, tim x 2A-3=3^x+100
e, 2A co phai la so chinh phuong khong
dag can gap
mn giup minh voi
cam on nhung ban nao da giup minh giai bai toan nay
Cho B=2+2^2+.....+2^2019
a, Tim x eN sao cho A+2=2^x+100
b, A+2 co phai la mot so chinh phuong khong
c, A =3+3^2+....+3^300
chung to A chia 13
d, 2A + 3 co phai la so chinh phuong ko
cho a bang 2^2+2^3+...+2^20 chung minh rang A+4 khong phai la so chinh phuong
ket qua cua phep tinh 3.7.5.9.11+3 co phai la so chinh phuong khong
Chung minh: Co 3 so chinh phuong se luon co 2 so co hieu chia het cho 4
Giup minh nhanh nhe, minh cho 3 tk!
cho cac so tu nhien n va 2n co tong cac chu so bang nhau
a) chung minh n chia het cho 9
b)tim so chinh phuong n co 3 chu so biet n chia het cho5 va 2n thi tong cac chu so khong doi
cho bieu thuc M= 5+52+53+.....+580chung to rang
a, M chia het cho 6
b, M khong phai la so chinh phuong
Cho A= 2. 4. 6. 8. 10 + 18
a) A co chia het cho 2, cho 3, cho 9 ko? vi sao?
b) A la hop so hay so nguyen to? vi sao?
c) Aco phai la so chinh phuong ko? vi sao?