Hãy nêu những khó khăn to lớn của các nước Châu Phi trong công cuộc xây dựng và phát triển kinh tế , xã hội từ những năm 80 của thế kỉ XX đến nay để giải quyết khó khăn các nước Châu Phi cần phải làm gì ?

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