giúp mik bài 3 câu b,d,g vs ạ.mik hứa vote 5 sao ạ.

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giúp mik bài 3 câu b,d,g vs ạ.mik hứa vote 5 sao ạ.
giup-mik-bai-3-cau-b-d-g-vs-a-mik-hua-vote-5-sao-a

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Farah 9 months 2020-10-29T17:46:12+00:00 2 Answers 44 views 0

Answers ( )

    0
    2020-10-29T17:47:17+00:00

    `b,`

    `xy-xz+y-z`

    `=x(y-z)+(y-z)`

    `=(y-z)(x+1)`

    `d,`

    `y^2(x^2+y)-zx^2-zy`

    `=y^2(x^2+y)-z(x^2+y)`

    `=(x^2+y)(y^2-z)`

    `g,`

    `ab^2+2a-3b^2-6`

    `=a(b^2+2)-3(b^2+2)`

    `=(b^2+2)(a-3)`

     

    0
    2020-10-29T17:47:35+00:00

    Đáp án:

    b/ $(2x-y)(2x+y-1)$

    d/ $(x-1)(x^3-x-1)$

    g/ $(5-x)(x^2+5x+25+xy)$

    Giải thích các bước giải:

    b/ $4x^2-2x-y^2+y$

    $=(4x^2-y^2)-(2x-y)$

    $=(2x-y)(2x+y)-(2x-y)$

    $=(2x-y)(2x+y-1)$

    d/ $x^4-x^3-x^2+1$

    $=(x^4-x^3)-(x^2-1)$

    $=x^3(x-1)-(x-1)(x+1)$

    $=(x-1)(x^3-x-1)$

    g/ $125-x^3+5xy-x^2y$

    $=(125-x^3)+(5xy-x^2y)$

    $=(5-x)(25+5x+x^2)+xy(5-x)$

    $=(5-x)(x^2+5x+25+xy)$

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