A= (x+1)^2-(x-2)^2-3(x+1)(x-1)

Question

A= (x+1)^2-(x-2)^2-3(x+1)(x-1)

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Gerda 4 years 2020-11-20T02:13:13+00:00 2 Answers 53 views 0

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    0
    2020-11-20T02:14:40+00:00

    Đáp án:

    $A = (x + 1)² – (x – 2)² – 3(x + 1)(x – 1)$

    $A = x² + 2x + 1 – (x² – 4x + 4) – 3(x² – 1)$

    $A = x² + 2x + 1 – x² + 4x – 4 – 3x² + 3$

    $A = -3x² + 6x $

    $A = -3x(x – 2)$

     

    0
    2020-11-20T02:15:03+00:00

    Khánh-;-

    a-1-2-2-2-3-1-1

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