Giúp mình vứoi mm ơi mình vote cho 5 sao

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Giúp mình vứoi mm ơi mình vote cho 5 sao
giup-minh-vuoi-mm-oi-minh-vote-cho-5-sao

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Helga 4 years 2020-11-16T13:17:02+00:00 1 Answers 70 views 0

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    0
    2020-11-16T13:18:39+00:00

    Đáp án:

    1. `x^2 + 2019x – 2020`

    `= x^2 – x + 2020x – 2020`

    `= x(x – 1) + 2020(x – 1)`

    `= (x – 1)(x + 2020)`

    2.`2020x^2 – x – 2021`

    ` = 2020x^2 – 2021x + 2020x – 2021`

    `=x(2020x – 2021) + (2020x – 2021)`

    `= (x + 1)(2020x – 2021)`

    3. `3x^2 – 7x – 10`

    `= 3x^2 + 3x – 10x – 10`

    `= 3x(x + 1) – 10(x + 1)`

    `= (x + 1)(3x – 10)`

    4. `5x^2 + 17x – 22`

    `= 5x^2 – 5x + 22x – 22`

    `= 5x(x – 1) + 22(x – 1)`

    `= (x – 1)(5x + 22)`

    5. `100x^2 + 100x – 201` (Đề sai)

    6. `x^3 – 15x^2 + 56x`

    `= x^3 – 8x^2 – 7x^2 + 56x`

    `= x^2 .(x – 8) – 7x(x – 8)`

    `= x(x – 8)(x – 7)`

    7.`x^3 + x^2 – 20x`

    `= x^3 – 4x^2 + 5x^2 – 20x`

    `= x^2 .(x – 4) + 5x.(x – 4)`

    `= x(x – 4)(x + 5)`

    8. `x^3 + 4x^2 – 21x`

    `= x^3 – 3x^2 + 7x^2 – 21x`

    `= x^2 .(x – 3) + 7x.(x – 3)`

    `= x(x – 3)(x + 7)`

    Giải thích các bước giải:

     

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