Tính \(α + β, α - β\), biết:
a) \(α = 3, β = 2i\) b) \(α = 1- 2i, β = 6i\).
c) \(α = 5i, β = -7i\) d) \(α = 15, β = 4- 2i\)
\(\begin{array}{l}
\left( {a + bi} \right) + \left( {c + di} \right) = \left( {a + c} \right) + \left( {b + d} \right)i\\
\left( {a + bi} \right) - \left( {c + di} \right) = \left( {a - c} \right) + \left( {b - d} \right)i
\end{array}\)
Lời giải chi tiết
a) \(α + β = 3 + 2i\), \(α - β = 3 - 2i\)
b) \(α + β = 1 + 4i\) \( α - β = 1 - 8i\)
c) \(α + β = -2i\), \( α - β = 12i\)
d) \(α + β = 19 - 2i\) \(α - β = 11 + 2i\)
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