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

Toán Lớp 8: 2xy(3x^2y-4xy^2)-1/2x^2y^2.(12x-16y) nhanh ạ

Toán Lớp 8: 2xy(3x^2y-4xy^2)-1/2x^2y^2.(12x-16y)
nhanh ạ

Comments ( 2 )

  1. 2xy(3x^2y-4xy^2)-1/2x^2y^2(12x-16y)
    =6x^3y^2-8x^2y^3-6x^3y^2+8x^2y^3
    =(6x^3y^2-6x^3y^2)-(8x^2y^3-8x^2y^3)
    =0

  2. 2xy(3x^2y-4xy^2)-1/2x^2y^2(12x-16y)
    =6x^3y^2-8x^2y^3-6x^3y^2+8x^2y^3
    =0
     

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