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

Toán Lớp 8: -4xy(2xy^2-3x^2y) làm tính nhân

Toán Lớp 8: -4xy(2xy^2-3x^2y) làm tính nhân

Comments ( 2 )

  1. $\#phnn$
    -4xy(2xy^2-3x^2y)
    =(-4xy.2xy^2)-(-4xy.3x^2y)
    =-8x^2y^3-(-12x^3y^2)
    =-8x^2y^3+12x^3y^2.
     

  2. -4xy(2xy^2-3x^2y)
    =(-4xy).2xy^2-(-4xy).3x^2y
    =-8x^2y^3+12x^3y^2

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