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

Toán Lớp 8: Hiệu hai lập phương 1/1000x^3 y^3 -1/8y^3

Toán Lớp 8: Hiệu hai lập phương
1/1000x^3 y^3 -1/8y^3

Comments ( 2 )

  1. 1/(1000)x^3y^3-1/8y^3
    =(1/(10)xy)^3-(1/2y)^3
    =(1/(10)xy-1/2y)(1/(100)x^2y^2+1/(20)xy^2+1/4y^2)
     

  2. 1/1000x^3y^3 – 1/8y^3
    = (1/10xy)^3 – (1/2y)^3
    = (1/100x^2y^2 + 1/20xy^2 + 1/4y^2)(1/10xy – 1/2y)

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

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