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

Toán Lớp 8: Bài 1: Thực Hiện phép tính `a) 2xy . (3x^2y – 5y)` `b) (3x – 1)(2x^2 + 3x – 4)`

Toán Lớp 8: Bài 1: Thực Hiện phép tính
a) 2xy . (3x^2y – 5y)
b) (3x – 1)(2x^2 + 3x – 4)

Comments ( 2 )

  1. a)2xy.(3x^2y-5y)
    =6x^3y^2-10xy^2
     b)(3x-1)(2x^2+3x-4)
    =6x^3+9x^2-12x-2x^2-3x+4
    =6x^3+(9x^2-2x^2)+(-12x-3x)+4
    =6x^3+7x^2-15x+4

  2. a)2xy(3x^2y-5y)
    =2xy.3x^2y-2xy.5y
    =6x^3y^2+10xy^2
    b)(3x-1)(2x^2+3x-4)
    =6x^3+9x^2-12x-2x^2-3x+4
    =6x^3+7x^2-15x+4

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