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minhthuminhthuong2001
2 năm trước
2^x+2^x+1+2^x+2+2^x+3=480 tính gọn a=2^2005-2^2004-2^2003-...-2^2-2-1 b=x.x^4.x^7........x^100 bài 3 tìm chữ số tận cùng 74^30 49^31 87^32 58^33 cho 40đ ạ
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