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222-9+11+12:2*14+14 = ? ( )

Toán Lớp 8: (x+1)^2+(x+3)^2=2(x-2)(x-1)+38 giair pt nhaaaa

Toán Lớp 8: (x+1)^2+(x+3)^2=2(x-2)(x-1)+38
giair pt nhaaaa

Comments ( 2 )

  1. Giải đáp: + Lời giải và giải thích chi tiết:
    $ (x+1)² + (x+3)² = 2(x-2)(x-1) + 38$
    $x² + 2x + 1 + x² + 6x + 9 = 2(x² – 3x + 2) + 38$
    $2x² + 8x + 10 = 2x² – 6x + 4 + 38$
    $2x² + 8x – 2x² + 6x = 42 – 10$
    $14x = 32$
    $x = \dfrac{16}{7}$

  2. ~ Bạn tham khảo ~
    (x+1)^2+(x+3)^2=2(x-2)(x-1)+38
    <=> x^2+2x+1+x^2+6x+9=2(x-2)(x-1)+38
    <=> 2x^2+8x+10=(2x-4)(x-1)+38
    <=> 2x^2+8x+10=2x^2-6x+4+38
    <=> 2x^2-2x^2+8x+6x=4+38-10
    <=> 14x=32
    <=> x = 16/7
    Vậy S={16/7}

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222-9+11+12:2*14+14 = ? ( )

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