A=5^5+5^2+5^3+...+5^100 là số nguyên tố hay hợp số?

Cho A = 55 + 52 + 53 + -. + 5100

a) A là số nguyên tố hay thừa số

b) Số A có phải là số chính phương không?

Các câu hỏi liên quan

Tính A=19/25(3/7+25/19)-3/7(19/25-7/3)

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