Viết các tích sau dưới dạng một lũy thừa: (-5) . (-5) . (-5) . (-5) . (-5).(-2) . (-2) . (-2)(-2) . (-2)
Hãy suy nghĩ và trả lời câu hỏi trước khi xem đáp án
Lời giải:
Báo saiDùng hoán vị ta có: \(% MathType!MTEF!2!1!+- % feaahqart1ev3aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn % hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr % 4rNCHbGeaGqiVu0Je9sqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9 % vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x % fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGceaqabeaaqaaaaa % aaaaWdbiaacIcacqGHsislcaaI1aWdaiaacMcapeGaaeiiaiaac6ca % caqGGaWdamaabmaabaWdbiabgkHiTiaaiwdaa8aacaGLOaGaayzkaa % WdbiaabccacaGGUaGaaeiia8aadaqadaqaa8qacqGHsislcaaI1aaa % paGaayjkaiaawMcaa8qacaqGGaGaaiOlaiaabccapaWaaeWaaeaape % GaeyOeI0IaaGynaaWdaiaawIcacaGLPaaapeGaaeiiaiaac6cacaqG % GaWdamaabmaabaWdbiabgkHiTiaaiwdaa8aacaGLOaGaayzkaaWdbi % aac6capaWaaeWaaeaapeGaeyOeI0IaaGOmaaWdaiaawIcacaGLPaaa % peGaaeiiaiaac6cacaqGGaWdamaabmaabaWdbiabgkHiTiaaikdaa8 % aacaGLOaGaayzkaaWdbiaabccacaGGUaGaaeiia8aadaqadaqaa8qa % cqGHsislcaaIYaaapaGaayjkaiaawMcaamaabmaabaWdbiabgkHiTi % aaikdaa8aacaGLOaGaayzkaaWdbiaabccacaGGUaGaaeiia8aadaqa % daqaa8qacqGHsislcaaIYaaapaGaayjkaiaawMcaaaqaaiabg2da98 % qacaGGOaGaeyOeI0IaaGyna8aacaGGPaWdbiaac6capaWaaeWaaeaa % peGaeyOeI0IaaGOmaaWdaiaawIcacaGLPaaacaGGUaWdbiaacIcacq % GHsislcaaI1aWdaiaacMcapeGaaiOla8aadaqadaqaa8qacqGHsisl % caaIYaaapaGaayjkaiaawMcaa8qacaGGOaGaeyOeI0IaaGyna8aaca % GGPaWdbiaac6capaWaaeWaaeaapeGaeyOeI0IaaGOmaaWdaiaawIca \begin{array}{l} ( - 5){\rm{ }}.{\rm{ }}\left( { - 5} \right){\rm{ }}.{\rm{ }}\left( { - 5} \right){\rm{ }}.{\rm{ }}\left( { - 5} \right){\rm{ }}.{\rm{ }}\left( { - 5} \right).\left( { - 2} \right){\rm{ }}.{\rm{ }}\left( { - 2} \right){\rm{ }}.{\rm{ }}\left( { - 2} \right)\left( { - 2} \right){\rm{ }}.{\rm{ }}\left( { - 2} \right)\\ = ( - 5).\left( { - 2} \right).( - 5).\left( { - 2} \right)( - 5).\left( { - 2} \right).( - 5).\left( { - 2} \right)( - 5).\left( { - 2} \right) = 10.10.10.10.10\\ = {10^5} \end{array}\)