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

Toán Lớp 8: a) 15 x5y3 : 1/3x2y2 b) ( x2 – 2xy + y2).(x – y)

Toán Lớp 8: a) 15 x5y3 : 1/3x2y2
b) ( x2 – 2xy + y2).(x – y)

Comments ( 2 )

  1.  a, 15x^5y^3 : 1/3x^2y^2 = (15:1/3)(x^5y^3:x^2y^2) = 45x^3y
      b,  (x^2-2xy+y^2)*(x-y) = (x-y)^2*(x-y) = (x-y)^3         
    Lời giải và giải thích chi tiết:
     

  2. a)15x^5y^3÷1/3x^2y^2
    =(15÷1/3)(x^5÷x^2)(y^3÷y^2)
    =5x^3y
    b)(x^2-2xy+y^2)(x-y)
    =(x-y)^2(x-y)
    =(x-y)^3

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

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