Giúp m 2 bài này nhé

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Giúp m 2 bài này nhé
giup-m-2-bai-nay-nhe

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Farah 4 years 2020-10-17T21:51:56+00:00 1 Answers 101 views 0

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  1. Ladonna
    0
    2020-10-17T21:53:08+00:00
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    $\text{Bài 1:}$

    `a,x^2+2x`

    `=x(x+2)`

    `b,5x^2(x-2y)+3x(x-2y)`

    `=(5x^2+3x)(x-2y)`

    `=x(5x+3)(x-2y)`

    `c,3(x-z)-5x(z-x)`

    `=3(x-z)+5x(x-z)`

    `=(3+5x)(x-z)`

    `d,-x^3+5x^2`

    `=x^2(5-x)`

    `e,3x^3z^3-6x^2y^2+9xz`

    `=3x(x^2z^3-2xy^2+3z)`

    `f,7x^2(x-3y)-14xy(3y-x)`

    `=7x^2(x-3y)+14xy(x-3y)`

    `=(7x^2+14xy)(x-3y)`

    `=7x(x+2y)(x-3y)`

    $\text{Bài 2:}$

    `B=(2x-1)^2+2x(2x-1)+x^2`

    `=4x^2-4x+1+4x^2-2x+x^2`

    `=9x^2-6x+1`

    `C=(x-1)(x+1)-(x+3)^2`

    `=x^2-1-x^2-6x-9`

    `=-6x-10`

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