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

Toán Lớp 8: Tìm x: (3x+5)(2x-1)+(1-5x)(x+2)+4=0

Tháng Tám 19, 2022 Toán học 1 Comment 0 views

Toán Lớp 8: Tìm x:
(3x+5)(2x-1)+(1-5x)(x+2)+4=0

Comments ( 1 )

  1. dinhcongson
    dinhcongson
    19 Tháng Tám, 2022 at 8:03 sáng
    Reply
    (3x+5)(2x-1)+(1-5x)(x+2)+4=0
    <=>6x^2-3x+10x-5+x+2-5x^2-10x+4=0
    <=>(6x^2-5x^2)+(-3x+10x+x-10x)+(-5+2+4)=0
    <=>x^2-2x+1=0
    <=>(x-1)^2=0
    <=>x-1=0
    <=>x=1
    Vậy S={1}

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

Nhi

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