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

Toán Lớp 8: Tìm x a, (x+2).(x+1)-(x+1)^2 =16 b, (x+2)^2 – (x-3).(x+4) = 24

Toán Lớp 8: Tìm x
a, (x+2).(x+1)-(x+1)^2 =16
b, (x+2)^2 – (x-3).(x+4) = 24

Comments ( 2 )

  1. a)
    (x+2)(x+1)-(x+1)^2=16
    <=>x^2+x+2x+2-x^2-2x-1-16=0
    <=>x-15=0
    <=>x=15
    Vậy S={15}
    b)
    (x+2)^2-(x-3)(x+4)=24
    <=>x^2+4x+4-x^2-4x+3x+12-24=0
    <=>3x-8=0
    <=>3x=8
    <=>x=8/3
    Vậy S={8/3}

  2. Đáp án:
     
    Giải thích các bước giải:
     

    toan-lop-8-tim-a-2-1-1-2-16-b-2-2-3-4-24

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