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

Toán Lớp 6: 1, 365-2030-65+3030 2, 4.2^2x−1 −3=125 Giải nhanh giúp mình với ạ

Toán Lớp 6: 1, 365-2030-65+3030
2, 4.2^2x−1 −3=125
Giải nhanh giúp mình với ạ

Comments ( 2 )

  1. 1,
    $365-2030-65+3030$
    $=(365-65) + (3030-2030)$
    $=300 + 1000$
    $=1300$
    2,
    4.$2^{2}$ x−1 −3=125
    4.$2^{2}$ x−1=125 + 3
    4.$2^{2}$ x−1=128
    $2^{2}$ x−1=128 : 4
    $2^{2}$ x−1=32
    x−1=32 : $2^{2}$ 
    $x−1=32 : 4$
    $x−1=8$
    $x=8 + 1$
    $x=9$

  2. 1,
    365 – 2030 – 65 + 3030
    = ( 365 – 65 ) + ( -2030 + 3030 )
    = 300 + 1000
    = 1300
    2,
    4. 2^{2x-1} – 3 = 125
    => 4. 2^{2x-1} = 125 + 3
    => 4. 2^{2x-1} = 128
    => 2^{2x-1} = 128 : 4
    => 2^{2x-1} = 32
    => 2^{2x-1} = 2^5
    => 2x – 1 = 5
    => 2x = 5 + 1
    => 2x = 6
    => x= 6 : 2
    => x = 3
      $\text{ Vậy x = 3 }$

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

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