共50条信息
若\( \dfrac {a}{1-i}=1-bi\),其中\(a\),\(b\)都是实数,\(i\)是虚数单位,则\(|a+bi|=\) ______
复数\({{z}_{1}}\),\({{z}_{2}}\)满足\({{z}_{1}}=m+\left( 4-{{m}^{2}} \right)i\),\({{z}_{2}}=2\cos \theta +\left( \lambda +3\sin \theta \right)i,\left( m,\lambda ,\theta \in R \right)\) ,并且\({{z}_{1}}={{z}_{2}}\),则\(λ \)的取值范围是______________.
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