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

Toán Lớp 8: thực hiện phép tính (x^2+3)(1+2x+2x^2)

Toán Lớp 8: thực hiện phép tính (x^2+3)(1+2x+2x^2)

Comments ( 2 )

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

  2. $ ( x^2 + 3 ) ( 1 + 2x + 2x^2 ) $
    $ = x^2 . 1 + 3 . 1 + x^2 . 2x + 3 . 2x + x^2 . 2x^2 + 3 . 2x^2 $
    $ = x^2 + 3 + 2x^3 + 6x + 2x^4 + 6x^2 $
    $ = 2x^4 + 2x^3 + 7x^2 + 6x + 3 $

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