d^2=-5

解答

d^{2} = - 5

d = 5 i, d = - 5 i

求解步骤

d^{2} = - 5

对于

x^{2} = f (a)

解为

x = f (a), - f (a)

d = - 5, d = - - 5

- 5 = 5 i

- - 5 = - 5 i

d = 5 i, d = - 5 i

f a c t or 8 x^{3} y^{3} + 27

(6 x^{2} - 7 x - 3) (x + 2) \geq 0

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s im pl i f y 3 - 9 \cdot 3 - 81

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