Cho a,b,c la cac chu so khac nhau va khac 0.Tim abc biet

a. abc=11.(a+b+c)

b. abc+bca+cab lamot so chinh phuong

c. abc+bca+cab=777

so chinh phuong la so bang binh phuong cua mot so tu nhien ( vi du 0 ,1,2,4,9,16,...0) moi tong sau day co so chinh phuong ko

a) 1mu 3 +2 mu 3

b)1mu 3+2mu 3 +3 mu 3

c)1 mu 3+ 2 mu 3 + 3 mu 3 +4 mu 3

tai minh ko biet go dau mu !

Chung to rang  tong sau khong la so chinh phuong  :

A=abc+bca+cab

Cac ban lam on nhanh gium minh voi

      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 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?

Cac Gia Tri Sau Co Phai So Chinh Phuong Khong

A=2+2^2+2^3+...+2^197

B=x^2012+(x+1)^2

B2

Tim n

n^2×2178 la so chinh phuong

so 144 co phai la so chinh phuong hay ko, cac so chinh phuong co chu so tan cung la gi.Cam on!

Mỗi Tổng (hieu) sau co la so chinh phuong k

3^2+4^2

3×5×7×9×11+3

2×3×4×5×6-3

Cac tong sau co la so chinh phuong khong ?

a) 11 * 13 * 15 * 17 * 19 + 2

b) 4 * 5 * 6 * 7 * 8 * 9

c) 15²⁰¹⁸ + 3 

d) 2016²⁰¹⁹ - 3

e) 11²⁰¹⁹ + 5²⁰¹⁹ + 16²⁰¹⁹

Nho cac ban giai gium