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haathii47
2 năm trước
Y = 2^8 + 3^12 + 4^16 + … + 2004^8016(tìm chữ số tận cùng) Chứng minh rằng chữ số tận cùng của hai tổng sau giống nhau : U = 2^1 + 3^5 + 4^9 + … + 2005^8013 V = 2^3 + 3^7 + 4^11 + … + 2005^8015 Chứng minh rằng không tồn tại các số tự nhiên x, y, z thỏa mãn : 19 ^x + 5 ^y + 1980z = 1975 ^430 + 2004
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