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

Toán Lớp 8: a) 9x 2 y(xy-2y+7xy 2 ) ; b) x(4x-2)(5+3x).

Toán Lớp 8: a) 9x 2 y(xy-2y+7xy 2 ) ;
b) x(4x-2)(5+3x).

Comments ( 2 )

  1. #huy
    a) 9x^2 y(xy-2y+7xy^2 )
    =9x^2y.xy-2.y.9x^2y+7xy^2 . 9x^2y
    =9x^3y^2-18x^2y^2+63x^3y^3
    b) x(4x-2)(5+3x)
    =(4x^2-2x)(5+3x)
    =4x^2(5+3x)-2x(5+3x)
    =20x^2+12x^3-10x-6x^2
    =12x^3+(20x^2-6x^2)-10x
    =12x^3+14x^3-10x
     

  2. Giải đáp + Lời giải và giải thích chi tiết !
    to Thực hiện phép tính:
    a)
    9x^2y(xy-2y+7xy^2)
    = (9x^2y. xy)-(9x^2y. 2y)+(9x^2y. 7xy^2)
    = 9x^3y^2-18x^2y^2+63x^3y^3
    b)
     x(4x-2)(5+3x)
    = (4x^2-2x)(5+3x)
    = 4x^2(5+3x)-2x(5+3x)
    = 20x^2+12x^3-10x-6x^2
    = 12x^3+(20x^2-6x^2)-10x
    = 12x^3+14x^2-10x

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

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