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

Toán Lớp 8: làm tính chia: `a)(15x^3y^2-6x^2y-3x^2y^2):6x^2y` `b)(4x^2-9y^2):(2x-3y)` `c)(x^3-3x^2y+3xy^2-y^3):(x^2-2xy+y^2)` `d)(6x^2+13x-5):(2x+5

Toán Lớp 8: làm tính chia:
a)(15x^3y^2-6x^2y-3x^2y^2):6x^2y
b)(4x^2-9y^2):(2x-3y)
c)(x^3-3x^2y+3xy^2-y^3):(x^2-2xy+y^2)
d)(6x^2+13x-5):(2x+5)
___________
không làm tắt.

Comments ( 1 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     a, (15x^3 y^2 -6x^2 y -3x^2 y^2 ): 6x^2 y
    =15x^3 y^2 : 6x^2 y -6x^2 y: 6x^2 y -3x^2 y^2 : 6x^2 y
    = 5/2 xy -1 -1/2 y
    b, (4x^2 -9y^2 ):(2x-3y)
    =(2x-3y)(2x+3y):(2x-3y)
    =2x+3y
    c,(x^3 -3x^2 y +3xy^2 -y^3 ):(x^2 -2xy +y^2 )
    =(x-y)^3 :(x-y)^2
    =x-y
    d, (6x^2 +13x -5 ):(2x+5)
    =(6x^2 +15x -2x -5):(2x+5)
    =[3x(2x+5)-(2x+5)]:(2x+5)
    =(2x+5)(3x-1):(2x+5)
    =3x-1
    (Bài tham khảo)

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