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

Toán Lớp 8: a) 3(x^2-7)-x(3x+5) Thực hiện phép tính

Toán Lớp 8: a) 3(x^2-7)-x(3x+5) Thực hiện phép tính

Comments ( 2 )

  1. a,
    3(x^2-7)-x(3x+5)
    =3x^2-21-3x^2-5x
    =(3x^2 – 3x^2)-21-5x
    =-5x-21

  2. ~Bạn tham khảo~
    a)
    3.(x^2-7)-x.(3x+5)
    =3.x^2-3.7-x.3x-x.5
    =3x^2-21-3x^2-5x
    =(3x^2-3x^2)-5x-21
    =-5x-21
     

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