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

Toán Lớp 8: Rút gọn biểu thức sau : ( 2x – 1 )^2 – 4 ( x + 7 ) ( x – 7 )

Toán Lớp 8: Rút gọn biểu thức sau : ( 2x – 1 )^2 – 4 ( x + 7 ) ( x – 7 )

Comments ( 2 )

  1. *Ta có: (2x-1)²-4.(x+7).(x-7)
    =4x²-4x+1-4.(x²-49)
    =4x²-4x+1-4x²+196
    =(4x²-4x²)-4x+197
    =-4x+197
    KL:Vậy:(2x-1)²-4.(x+7).(x-7)=-4x+197
    \text{#Trang}

  2. $ ( 2x – 1 )^{2} – 4 ( x + 7 ) ( x – 7 ) $
    $ = 4x^{2} – 4x + 1 – 4 ( x^{2} – 49 )$
    $ = 4x^{2} – 4x + 1 – 4x^{2} + 196 $
    $ = 197 – 4x $
     

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

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