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

Toán Lớp 8: a,3x(6x-1)-2x(9x-3) bu,(x+5)(x+6)-x^2

Toán Lớp 8: a,3x(6x-1)-2x(9x-3)
bu,(x+5)(x+6)-x^2

Comments ( 2 )

  1. a,3x(6x-1)-2x(9x-3)
    =18x^2-3x-18x^2+6x
    =-3x+6x=3x
    b,(x+5)(x+6)-x^2
    =x^2+6x+5x+30-x^2
    =11x+30
    xin hay nhất…!!!

  2. a) 3x(6x-1)- 2x(9x-3)
    = 18x^2- 3x- 18x^2+ 6x
    = 3x
    ______________________
    b)(x+5)(x+6)- x^2
    = x^2+ 6x+5x+ 30- x^2
    = 11x+ 30
     

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

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