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أي مما يأتي يكافئ العبارة : 

( r 3 2 r 2 +1 ) ( r2 ) 1 MathType@MTEF@5@5@+= feaagGart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqk0Jf9crFfpeea0xh9v8qiW7rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeaacaGaaiaabeqaamaabaabaaGcbaWaaeWaaeaaca WGYbWaaWbaaSqabeaacaaIZaaaaOGaeyOeI0IaaGOmaiaadkhadaah aaWcbeqaaiaaikdaaaGccqGHRaWkcaaIXaaacaGLOaGaayzkaaWaae WaaeaacaWGYbGaeyOeI0IaaGOmaaGaayjkaiaawMcaamaaCaaaleqa baGaeyOeI0IaaGymaaaaaaa@46A6@

r 2 + 1 r2 MathType@MTEF@5@5@+= feaagGart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqk0Jf9crFfpeea0xh9v8qiW7rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeaacaGaaiaabeqaamaabaabaaGcbaGaamOCamaaCa aaleqabaGaaGOmaaaakiabgkHiTiaaikdacaWGYbGaey4kaSYaaSaa aeaacaaIXaaabaGaamOCaiabgkHiTiaaikdaaaaaaa@40DB@

r 2 1 r2 MathType@MTEF@5@5@+= feaagGart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqk0Jf9crFfpeea0xh9v8qiW7rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeaacaGaaiaabeqaamaabaabaaGcbaGaamOCamaaCa aaleqabaGaaGOmaaaakiabgUcaRiaaikdacaWGYbGaeyOeI0YaaSaa aeaacaaIXaaabaGaamOCaiabgkHiTiaaikdaaaaaaa@40DB@

r 2 +2r+ 1 r2 MathType@MTEF@5@5@+= feaagGart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr 4rNCHbGeaGqk0Jf9crFfpeea0xh9v8qiW7rqqrFfpeea0xe9Lq=Jc9 vqaqpepm0xbba9pwe9Q8fs0=yqaqpepae9pg0FirpepeKkFr0xfr=x fr=xb9adbaqaaeaacaGaaiaabeqaamaabaabaaGcbaGaamOCamaaCa aaleqabaGaaGOmaaaakiabgUcaRiaaikdacaWGYbGaey4kaSYaaSaa aeaacaaIXaaabaGaamOCaiabgkHiTiaaikdaaaaaaa@40D0@

            
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