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

Toán Lớp 7: tìm x a) 3/x-4 = x+4/3 b) x+2 / x+6 = 3 / x+ 1

Tháng Tám 10, 2022 Toán học 1 Comment 0 views

Toán Lớp 7: tìm x
a) 3/x-4 = x+4/3
b) x+2 / x+6 = 3 / x+ 1

Comments ( 1 )

  1. thanhthuythu
    thanhthuythu
    10 Tháng Tám, 2022 at 1:40 chiều
    Reply
    a) 3/(x-4)=(x+4)/(3) (xne4)
    ⇔3.3=(x-4)(x+4)
    ⇔9=x^2+4x-4x-16
    ⇔9+16=x^2
    ⇔25=x^2
    ⇔x^2=+-5 ™
    Vậy x=+-5
    b) (x+2)/(x+6)=3/(x+1) (xne-6,xne-1)
    ⇔(x+2)(x+1)=3(x+6)
    ⇔x^2+x+2x+2=3x+18
    ⇔x^2+3x-3x=18-2
    ⇔x^2=16
    ⇔x=+-4 ™
    Vậy x=+-4
     

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

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