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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 6: 2019 mũ 10 + 2019 mũ 9 và 2020 mũ 10

Toán Lớp 6: 2019 mũ 10 + 2019 mũ 9 và 2020 mũ 10

Comments ( 2 )

  1. Ta có:
    2019^10+2019^9=2019^9.(2019+1)=2019^9.2020
    2020^10=2020^9.2020
    Vì 2019^9<2020^9
    Nên 2019^9.2020<2020^9.2020
    Hay 2019^10+2019^9< 2020^10
    Chúc bạn học tốt !!!
    Cho mình xin 5 sao và ctlhn nha :>
     

  2. – So sánh $2019^{10}+2019^9$ với $2020^10$:
     + $2019^{10}+2019^9=2019^{9+1}+2019^9=2019^9(2019+1)=2019^9.2020$
     + $2020^{10}=2020^{9+1}=2020^9.2020$
    – Vậy ta thấy $2019^9<2020^9$
    ⇒ $2019^{10}+2019^9<2020^{10}$

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222-9+11+12:2*14+14 = ? ( )