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

Toán Lớp 6: 5.(x-1) mũ 2 – 7+13 mong giúp I love you

Toán Lớp 6: 5.(x-1) mũ 2 – 7+13 mong giúp I love you

Comments ( 1 )

  1. $  5 ( x – 1 )^2 -7 + 13 $
    $ = 5 ( x- 1 ) ( x- 1 ) – 7 + 13 $
    $ = 5 ( x^2 -x – x + 1 ) – 7 + 13 $
    $ = 5 ( x^2 – 2x + 1 ) – 7 +13 $
    $ = 5x^2 – 10x + 5 – 7 +13 $
    $ = 5x^2 – 10x +11 $

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