(2020-x)3 +(2022-x)3 + (2x-4042)2=0

1 bình luận về “(2020-x)3 +(2022-x)3 + (2x-4042)2=0”

1. ( 2020 – x ) . 3 + ( 2022 – x ) . 3 + ( 2x – 4042 ) . 2 = 0

   TH1 :

   ( 2020 – x ) . 3 = 0

   ⇔ 2020 – x = 0

   ⇔ x = 2020

   TH2 :

   ( 2022 – x ) . 3 = 0

   ⇔ 2022 – x = 0

   ⇔ x = 2022

   TH3 :

   ( 2x – 4042 ) . 2 = 0

   ⇔ 2x – 4042 = 0

   ⇔ 2x = 4042

   ⇔ x = 2021

   Vậy S = { 2020 ; 2022 ; 2021 }

    

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