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

Toán Lớp 6: a/ 89 – (73 – x) = 20 b/ x – 36 : 18 = 12 + 15 c/ 16. 4^x = 4⁸ d/ 8.x + 20 = 76

Tháng Hai 21, 2023 Toán học 0 Comments 0 views

Toán Lớp 6: a/ 89 – (73 – x) = 20
b/ x – 36 : 18 = 12 + 15
c/ 16. 4^x = 4⁸
d/ 8.x + 20 = 76

Comments ( 2 )

  1. thaolanphuobg
    thaolanphuobg
    21 Tháng Hai, 2023 at 11:20 chiều
    Reply
    $ a) 89 – ( 73 – x ) = 20 $
    $ 73 – x = 89 – 20 = 69 $
    $ x = 73 – 69 = 4 $
    $ b) x – 36 : 18 = 12 + 15 = 27 $
    $ x – 2 = 27 $
    $ x = 27 + 2 = 29 $ 
    $ c) 16 . 4^x = 4^8 $
    $ 4^2 . 4^x = 4^8 $
    $ 4^{2+x} = 4^8 $
    $ ⇒ 2 + x = 8 $
    $ x = 8 – 2 = 6 $
    $ d) 8x + 20 = 76 $
    $ 8x = 76 – 20 = 56 $
    $ x = 56 : 8 = 7 $ 

  2. ngocbichchau
    ngocbichchau
    21 Tháng Hai, 2023 at 11:20 chiều
    Reply
    $\text{a/ 89 – (73 – x) = 20}$ $\\$ $\text{73 – x = 89 – 20}$ $\\$ $\text{73 – x = 69}$ $\\$ $\text{x = 73 – 69}$ $\\$ $\text{x = 4}$ $\\$ $\text{b/ x – 36 : 18 = 12 + 15 }$ $\\$ $\text{x – 2 = 27}$ $\\$ $\text{x = 27 + 2}$ $\\$ $\text{x = 29}$ $\\$ $\text{c/ 16. $4^{x}$ = $4^{8}$}$ $\\$ $\text{$4^{2}$ $4^{x}$ = $4^{8}$}$ $\\$ $\text{$4^{2 + x}$ = $4^{8}$}$ $\\$ $\text{2 + x = 8}$ $\\$ $\text{x = 8 – 2}$ $\\$ $\text{x = 6}$ $\\$ $\text{d/ 8.x + 20 = 76}$ $\\$ $\text{8x = 76 – 20}$ $\\$ $\text{8x = 56}$ $\\$ $\text{x = 56 : 8}$ $\\$ $\text{x = 7}$
     

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

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