Thực hiện phép nhân: $(5x^{2}$- $3x^{3}$$+4x-1)$ $(-2x^{2}$$+3-6x)$

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Thực hiện phép nhân:
$(5x^{2}$- $3x^{3}$$+4x-1)$ $(-2x^{2}$$+3-6x)$

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Sapo 4 years 2020-11-02T04:24:19+00:00 2 Answers 77 views 0

Answers ( )

  1. King
    1
    2020-11-02T04:25:22+00:00
    Reply

    (5x^2-3x^3+4x-1)(-2x^2+3-6x)

    =-10x^4+15x^2-30x^3+6x^5-9x^3+18x^4-8x^3+12x-24x^2

    =6x^5+8x^4-47x^3-7x^2+18x-3

     

  2. Tryphena
    0
    2020-11-02T04:25:59+00:00
    Reply

    $(5x^2-3x^3+4x-1)(-2x^2+3-6x)$

    $=5x^2.(-2x^2+3-6x)-3x^3(-2x^2+3-6x)+4x(-2x^2+3-6x)-1(-2x^2+3-6x)$

    $=5x^2.(-2x^2)+5x^2.3-5x^2.6x-3x^3.(-2x^2)-3x^2.3-3x^2.(-6x)-2x^2-3+6x$

    $=-10x^4+15x^2-30x^3+6x^5-6x^2+18x^3-2x^2-3+6x$

    $=6x^5-10x^4-12x^3+7x^2-3$

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )