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

Toán Lớp 6: Bài 2: Tìm x, biết: A, 6x-45=-111-(75-111) B, 5x-1=25²:25

Toán Lớp 6: Bài 2: Tìm x, biết:
A, 6x-45=-111-(75-111)
B, 5x-1=25²:25

Comments ( 2 )

  1. $ a) 6x – 45 = -111 – ( 75 – 111 ) = -111 – 75 + 111 = -75 $ 
    $ 6x = -75 + 45=-30 $ 
    $ x=-30:6=-5 $
    $ b) 5x-1=25^2:25=25 $
    $ 5x=25+1=26 $
    $ x=26:5=26/5 $
     

  2. Lời giải và giải thích chi tiết:
    a)
    6x – 45 = -111 – (75 – 111)
    -> 6x – 45 = -111 – 75 + 111
    -> 6x – 45 = -75
    -> 6x = -30
    -> x = -5
    b)
    5x – 1 = 25^2 : 25
    -> 5x – 1 = 25
    -> 5x = 26
    -> x = 26/5

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