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

Toán Lớp 8: mn giúp e vs ạ, e cảm ơn trc ạ (5x^4y^3-2x^2y+6xy):(-1/4xy)

Toán Lớp 8: mn giúp e vs ạ, e cảm ơn trc ạ
(5x^4y^3-2x^2y+6xy):(-1/4xy)

Comments ( 2 )

  1.  (5x^4y^3 – 2x^2y + 6xy) : (-1/4 xy)
    =  – 5x^4y^3  : 1/4 xy + 2x^2y : 1/4 xy – 6xy : 1/4xy
    =  (-5: 1/4).(x^4:x).(y^3:y) + (2:1/4).(x^2:x).  (y:y) – (6:1/4) . (x:x).(y:y)
    = -20x^3y^2 + 8 x – 24

  2. (5x^4 y^3 – 2x^2 y+6xy) : ( -1/4 xy)
    = -20x^3 y^2 + 8x – 24
    đây là cách làm tắt!
    hok tốt!
     

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