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

Toán Lớp 8: c) 6x(5x + 3) + 3x(1 – 10x) = 7

Home/ Toán Lớp 8: c) 6x(5x + 3) + 3x(1 – 10x) = 7

Toán Lớp 8: c) 6x(5x + 3) + 3x(1 – 10x) = 7

Tháng Chín 28, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: c) 6x(5x + 3) + 3x(1 – 10x) = 7

Comments ( 2 )

  1. baoquyen
    baoquyen
    28 Tháng Chín, 2022 at 8:18 sáng
    Reply
    6x(5x+3)+3x(1-10x)=7
    ⇔30x^2+18x+3x-10x^2=7
    ⇔(30x^2-30x^2)+(18x+3x)=7
    ⇔21x=7⇒x=1/3

  2. tuyen98
    tuyen98
    28 Tháng Chín, 2022 at 8:18 sáng
    Reply
    c) 6x(5x + 3)+3x(1-10x)=7
    <=>30x^2+18x+3x-30x^2=7
    <=>21x=7
    =>x=7/21
    =>x=1/3
     

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

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