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ltthaothd
2 năm trước
Câu 53: Cho đa thức bậc hai P(x) = ax2 + bx +c (với a; b; c là các hằng số). Chọn số thích hợp trong các ô trống sau: | 1) Nếu c = 0 thì x= -1 là một nghiệm của P(z). | 2) Nếu a+b+c=0 thì a = v là một nghiệm của P(z). 3) Nếu a-b+c=0 thì a = 1 v là một nghiệm của P(x)
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