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

Toán Lớp 8: 1/ tìm x biết a,(2x+1).(2x-1)-(x+5).(4x-1)=10 b,(6x²-(2x-3).(3x-1)=4

Tháng Chín 28, 2022 Toán học 2 Comments 0 views

Toán Lớp 8: 1/ tìm x biết
a,(2x+1).(2x-1)-(x+5).(4x-1)=10
b,(6x²-(2x-3).(3x-1)=4

Comments ( 2 )

  1. huenthanh97
    huenthanh97
    28 Tháng Chín, 2022 at 12:54 chiều
    Reply
    a) (2x+1)(2x-1)-(x+5)(4x-1)=10
    ⇔4x^2-1-4x^2+x-20x+5=10
    ⇔21x+4=10
    ⇔-19x=6
    ⇔x=-6/(19)
    Vậy S={-6/(19)}
    b) 6x^2-(2x-3)(3x-1)=4
    ⇔6x^2-6x^2+2x+9x-3=4
    ⇔11x=4+3
    ⇔11x=7
    ⇔x=7/(11)
    Vậy S={7/(11)}
     

  2. diepbich93
    diepbich93
    28 Tháng Chín, 2022 at 12:54 chiều
    Reply
    y10000
     

    toan-lop-8-1-tim-biet-a-2-1-2-1-5-4-1-10-b-6-2-3-3-1-4

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

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