Gọi \(z_0\) là nghiệm phức có phần ảo âm của phương trình \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVCI8FfYJH8YrFfeuY-Hhbbf9v8qqaqFr0xc9pk0xbb % a9q8WqFfeaY-biLkVcLq-JHqpepeea0-as0Fb9pgeaYRXxe9vr0-vr % 0-vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaiaaikdacaWG6b % WaaWbaaSqabeaacaaIYaaaaOGaeyOeI0IaaGOnaiaadQhacqGHRaWk % caaI1aGaeyypa0JaaGimaaaa!3EA3! 2{z^2} - 6z + 5 = 0\). Số phức \(iz_0\) bằng
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Lời giải:
Báo saiTa có \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVCI8FfYJH8YrFfeuY-Hhbbf9v8qqaqFr0xc9pk0xbb % a9q8WqFfeaY-biLkVcLq-JHqpepeea0-as0Fb9pgeaYRXxe9vr0-vr % 0-vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaiaaikdacaWG6b % WaaWbaaSqabeaacaaIYaaaaOGaeyOeI0IaaGOnaiaadQhacqGHRaWk % caaI1aGaeyypa0JaaGimaaaa!3EA3! 2{z^2} - 6z + 5 = 0\)\(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVCI8FfYJH8YrFfeuY-Hhbbf9v8qqaqFr0xc9pk0xbb % a9q8WqFfeaY-biLkVcLq-JHqpepeea0-as0Fb9pgeaYRXxe9vr0-vr % 0-vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaiabgsDiBlaais % dacaWG6bWaaWbaaSqabeaacaaIYaaaaOGaeyOeI0IaaGymaiaaikda % caWG6bGaey4kaSIaaGymaiaaicdacqGH9aqpcaaIWaGaeyi1HS9aae % WaaeaacaaIYaGaamOEaiabgkHiTiaaiodaaiaawIcacaGLPaaadaah % aaWcbeqaaiaaikdaaaGccqGH9aqpcqGHsislcaaIXaGaeyypa0Jaam % yAamaaCaaaleqabaGaaGOmaaaakiabgsDiBlaadQhacqGH9aqpdaWc % aaqaaiaaiodacqGHXcqScaWGPbaabaGaaGOmaaaaaaa!5906! \Leftrightarrow 4{z^2} - 12z + 10 = 0 \Leftrightarrow {\left( {2z - 3} \right)^2} = - 1 = {i^2} \Leftrightarrow z = \frac{{3 \pm i}}{2}\)
\(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVCI8FfYJH8YrFfeuY-Hhbbf9v8qqaqFr0xc9pk0xbb % a9q8WqFfeaY-biLkVcLq-JHqpepeea0-as0Fb9pgeaYRXxe9vr0-vr % 0-vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaiabgkDiElaadQ % hadaWgaaWcbaGaaGimaaqabaGccqGH9aqpdaWcaaqaaiaaiodaaeaa % caaIYaaaaiabgkHiTmaalaaabaGaaGymaaqaaiaaikdaaaGaamyAai % abgkDiElaadMgacaWG6bWaaSbaaSqaaiaaicdaaeqaaOGaeyypa0Za % aSaaaeaacaaIXaaabaGaaGOmaaaacqGHRaWkdaWcaaqaaiaaiodaae % aacaaIYaaaaiaadMgaaaa!4B45! \Rightarrow {z_0} = \frac{3}{2} - \frac{1}{2}i \Rightarrow i{z_0} = \frac{1}{2} + \frac{3}{2}i\)
Đề thi thử tốt nghiệp THPT QG môn Toán năm 2020
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