Cho hàm số \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVCI8FfYJH8YrFfeuY-Hhbbf9v8qqaqFr0xc9pk0xbb % a9q8WqFfeaY-biLkVcLq-JHqpepeea0-as0Fb9pgeaYRXxe9vr0-vr % 0-vqpWqaaeaabiGaciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaape % GaamOzamaabmaapaqaa8qacaWG4baacaGLOaGaayzkaaGaeyypa0Za % aiqaa8aaeaqabeaapeGaamiEaiaaykW7caaMc8UaaGPaVlaabUgaca % qGObGaaeyAa8aacaaMe8+dbiaadIhacqGHLjYScaaIXaaapaqaa8qa % caaIXaGaaGPaVlaaykW7caaMc8UaaGPaVlaabUgacaqGObGaaeyAa8 % aacaaMe8+dbiaadIhacqGH8aapcaaIXaaaaiaawUhaaaaa!579F! f\left( x \right) = \left\{ \begin{array}{l} x\,\,\,{\rm{khi}}\;x \ge 1\\ 1\,\,\,\,{\rm{khi}}\;x < 1 \end{array} \right.\), tính tích phân \(% MathType!MTEF!2!1!+- % feaahqart1ev3aqaMnevLHfij5gC1rhimfMBNvxyNvgaCLMB0XfBP1 % wA0n3x7btFETNm9TNzCXwzMrhkGGhiCjxANHgDPWfDLHhD7rwF41ha % tCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLnhiov2DGi1BTfMBae % XatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr4rNCHbGeaGqiVCI8 % FfYJH8YrFfeuY-Hhbbf9v8qqaqFr0xc9pk0xbba9q8WqFfeaY-biLk % VcLq-JHqpepeea0-as0Fb9pgeaYRXxe9vr0-vr0-vqpWqaaeaabiGa % ciaacaqabeaadaqaaqaaaOqaaabaaaaaaaaapeWaa8qCa8aabaWdbi % aadAgadaqadaWdaeaapeGaamiEaaGaayjkaiaawMcaaiaabsgacaWG % 4baal8aabaWdbiaaicdaa8aabaWdbiaaikdaa0Gaey4kIipaaaa!5968! \int\limits_0^2 {f\left( x \right){\rm{d}}x} \).

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