网页1.对于一元二次恒等式的牛顿恒等式 (Newton's Identities for a Quadratic Polynomial) 其中 A=-\frac {b} {a},B=\frac {c} {a}. 证明:. 根据韦达定理可知, \alpha_ {1}+\alpha_ {2}=-\frac {b} {a},\alpha_ {1} \alpha_ {2}=\frac {c} {a} P_ {0}=\alpha_ {1}^ {0}+\alpha_ {2}^ {0} =2. P_ {1}=\alpha_ {1}^ {1}+\alpha_ {2}^ {1 ...