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

Toán Lớp 6: Tìm x ( nhanh giúp em với ạ ) 1 . 106 – 3 ( x + 7 ) = 2 mũ 7 : 2 mũ 5 2 . 2 . x + 15 = 142 : 2 3 . x – 4300 – ( 5250 : 1050 . 250 )

Toán Lớp 6: Tìm x ( nhanh giúp em với ạ )
1 . 106 – 3 ( x + 7 ) = 2 mũ 7 : 2 mũ 5
2 . 2 . x + 15 = 142 : 2
3 . x – 4300 – ( 5250 : 1050 . 250 ) = 4250

Comments ( 2 )

  1. 106 – 3 . (x + 7) = 2^{7} : 2^{5}
    $\Rightarrow$ 106 – 3 . (x + 7) = 2^{2}
    $\Rightarrow$ 106 – 3 . (x + 7) = 4
    $\Rightarrow$ 3 . (x + 7) = 106 – 4
    $\Rightarrow$ 3 . (x + 7) = 102
    $\Rightarrow$ (x + 7) = 102 : 3
    $\Rightarrow$ x + 7 = 34
    $\Rightarrow$ x = 34 – 7
    $\Rightarrow$ x = 27
    $\text{Vậy}$ x = 27
    ____________________
    2x + 15 = 142 : 2
    $\Rightarrow$ 2x + 15 = 71
    $\Rightarrow$ 2x = 71 – 15
    $\Rightarrow$ 2x = 56
    $\Rightarrow$ x = 56 : 2
    $\Rightarrow$ x = 28
    $\text{Vậy}$ x = 28
    _____________________
    x – 4300 – (5250 : 1050 . 250) = 4250
    $\Rightarrow$ x – 4300 – (5 . 250) = 4250
    $\Rightarrow$ x – 4300 – 1250 = 4250
    $\Rightarrow$ x – 4300 = 4250 + 1250
    $\Rightarrow$ x – 4300 = 5500
    $\Rightarrow$ x = 5500 + 4300
    $\Rightarrow$ x = 9800
    $\text{Vậy}$ x = 9800

  2. 1) 106-3(x+7)= 2^7:2^5
    => 106-3(x+7)= 2^2
    => 106-3(x+7)= 4
    => 3(x+7)= 102
    => x+7= 34
    => x= 27
    2) 2x+15= 142:2
    => 2x+15= 71
    => 2x= 56
    => x= 28
    3) x-4300-(5250:1050.250)= 4250
    => x-4300-1250= 4250
    => x-4300= 5500
    => x= 9800

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

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