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?

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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?

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?
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?

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?
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

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