Mathematics, 21.06.2021 16:00, tatertott6633

1. Rút gọn biểu thức 2 5 a 3 3 a 1 a 2 a 8 A a 2 a 2 a 4 − + + + = + − − + − với a 0,a 4   . 2. Giải hệ phương trình sau: 2 5 3 2 6 x y x y  − =  − + = − 3. Cho phương trình 2 2 x m x m − + + = 2( 2) 0 −4 ( x là ẩn, m là tham số) (1). a. Giải phương trình (1) với m = −1 b. Tìm m để phương trình (1) có hai nghiệm phân biệt 1 2 x x, cùng dương thỏa mãn 1 2 2 1 8 x x x x − = .

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1. Rút gọn biểu thức 2 5 a 3 3 a 1 a 2 a 8 A a 2 a 2 a 4 − + + + = + − − + − với a 0,a 4   . 2. Gi...