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long12341234
2 năm trước
1,tìm giá trị của m để phương trình 2x-m=1-x nhận giá trị x=-1 là nghiệm. 2,rút gọn biểu thức a=(1/x+1 trừ 1/x^2-1).x+1/x-2 với x khác 1,x khác -1 và x khác 2
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