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

Toán Lớp 8: khai triển biểu thức (2+y^2)^3

Toán Lớp 8: khai triển biểu thức (2+y^2)^3

Comments ( 2 )

  1. (2 + y^2)^3
    = (y^2 + 2)^3
    = (y^2)^3 + 3 . (y^2)^2 . 2 + 3 . y^2 . 2^2 + 2^3
    = y^6 + 6y^4 + 12y^2 + 8

  2.    (2+y²)³ 
    = 2³+3.2².y²+3.2.(y²)²+(y²)³
    = 8+12y²+6$y^4$+$y^6$

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

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