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

Toán Lớp 8: rút gọi biểu thứcB=(x-2)(x+2)-(x-2)^2

Toán Lớp 8: rút gọi biểu thứcB=(x-2)(x+2)-(x-2)^2

Comments ( 2 )

  1. B=(x-2)(x+2)-(x-2)^2
    B=x^2-4-(x^2-4x+4)
    B=x^2-4-x^2+4x-4
    B=4x-8

  2. B = ( x – 2 ) ( x + 2 ) – ( x – 2 )^2
    B = ( x – 2 ) ( x + 2 – x + 2 )
    B = ( x – 2 ) 4

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

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