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gntinh
2 năm trước
Cho phương trình `x^2+3x-7=0(1).` Gọi `x_1;x_2` là hai nghiệm của phân biệt của phương trình `(1).` Không giải phương trình hãy tính giá trị của biểu thức `F=x_1^2-3x_2-2013`
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