Làm hộ mik bài 6 nha, cảm ơn các bạn :3

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Làm hộ mik bài 6 nha, cảm ơn các bạn :3
lam-ho-mik-bai-6-nha-cam-on-cac-ban-3

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Kiệt Gia 4 years 2020-10-14T21:40:24+00:00 2 Answers 82 views 0

Answers ( )

  1. mit
    0
    2020-10-14T21:42:02+00:00
    Reply

    Đáp án: 1) 2x²+3x-5

    = 2x²-2x+5x-5

    = 2x(x-1)+5(x-1)

    = (x-1).(2x+5)

    2) 7x²-8x+1 

    = 7x²-7x-x+1

    = 7x(x-1)-(x-1)

    = (x-1).(7x-1)

    3) 15x²-3x-12

    = 15x²-15x+12x-12

    = 15x(x-1)+12(x-1)

    = (x-1).(15x+12)

    4) 10x²-2x-8

    = 10x²-10x+8x-8

    = 10x(x-1)+8(x-1)

    = (x-1).(10x+8)

    5) 7x²-15x-22

    = 7x²+7x-22x-22

    = 7x(x+1)-22(x+1)

    = (x+1).(7x-22)

  2. Latifah
    0
    2020-10-14T21:42:14+00:00
    Reply

    a) `2x²+3x-5`

    `= 2x²+3x-2-3`

    `= (2x²-2)+(3x-3)`

    `= 2(x²-1)+3(x-1)`

    b) `7x²-8x+1`

    `= 7x²-7x-x+1`

    `= (7x²-7x)-(x-1)`

    `= 7x(x-1)-(x-1)`

    `= (7x-1)(x-1)`

    c) `15x²-3x-12`

    `= 12x²+3x²-3x-12`

    `= (12x²-12)+(3x²-3x)`

    `= 12(x²-1)+3x(x-1)`

    d) `10x²-2x-8`

    `= 8x²+2x²-2x-8`

    `= (8x²-8)+(2x²-2x)`

    `= 8(x²-1)+2x(x-1)`

    e) `7x²-15x-22`

    `= 7x²-15x-15-7`

    `= (7x²-7)-(15x+15)`

    `= 7(x²-1)-15(x+1)`

     

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