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

Toán Lớp 8: Tìm x,biết: a) (x+2)(x+5) –x(x+3) = 18

Toán Lớp 8: Tìm x,biết:
a) (x+2)(x+5) –x(x+3) = 18

Comments ( 2 )

  1. $a)$
    ⇔(x+2)(x+5) –x(x+3) = 18
    ⇔x^2 + 5x + 2x + 10 – x^2 – 3x = 18
    ⇔4x + 10 = 18
    ⇔ x = 2
    ______________________________
    $#Rosé$
     

  2. Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-8-tim-biet-a-2-5-3-18

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

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