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

Toán Lớp 6: Tìm X: 2^x+3*4^2=64 3^x+3^x+2=270 * = dấu nhân nhaaaa :D

Toán Lớp 6: Tìm X:
2^x+3*4^2=64
3^x+3^x+2=270
* = dấu nhân nhaaaa
😀

Comments ( 2 )

  1. 2^ x+3*4^2=64   
    2^x+3.16=64
    2^x+48=64
    2^x=64-48
    2^x=16
    2^x=2^4
    x=4
    3^ x + 3 ^ x + 3 ^ 2 = 270
    => 3 ^ x . 1 + 3 ^ x . 9 = 270
    => 3 ^ x . ( 1 + 9 ) = 270
    => 3 ^ x . 10 = 270
    => 3 ^ x = 27
    => x = 3
     

  2. Giải đáp:
     $a) 2^{x}+3.4²=64$
    $⇒ 2^{x}+ 3.16=64$
    $⇒ 2^{x}+ 48=64$
     $⇒ 2^{x}= 64-48$
    $⇒ 2^{x}= 16$
    $⇒ 2^{x}= 2^4$
    $⇒ x=4$
    $Vậy$ $x=4$
    $b) 3^{x}+3^{x+2}=270$
    $⇒ 3^{x}.1+3^{x}.3^2=270$
    $⇒ 3^{x}.(1+3²)=270$
    $⇒ 3^{x}.10=270$
    $⇒ 3^{x}= 27$
    $⇒ 3^{x}=3^3$
    $⇒ x=3$
    $Vậy$ $x=3$

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

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