SAT2数学题求救Let z be a complex solution to the equation x2 – 2x
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SAT2数学题求救
Let z be a complex solution to the equation x2 – 2x + 2 = 0.What does equal?
(A) 1
(B) 1.41
(C) 2.45
(D) 3
(E) 3.73
是问What does z的模 equal?
Let z be a complex solution to the equation x2 – 2x + 2 = 0.What does equal?
(A) 1
(B) 1.41
(C) 2.45
(D) 3
(E) 3.73
是问What does z的模 equal?
![SAT2数学题求救Let z be a complex solution to the equation x2 – 2x](/uploads/image/z/18602629-61-9.jpg?t=SAT2%E6%95%B0%E5%AD%A6%E9%A2%98%E6%B1%82%E6%95%91Let+z+be+a+complex+solution+to+the+equation+x2+%E2%80%93+2x)
模就是两根之和的平方和
先求两根之和(韦达定理)再求两根之积(韦达定理)
两根之和的平方减去两根之积的两倍就是答案
先求两根之和(韦达定理)再求两根之积(韦达定理)
两根之和的平方减去两根之积的两倍就是答案
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