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

Toán Lớp 8: tìm x: a, 2019x(x-8)+x-8 =0 b, 4x^2+5x =6

Toán Lớp 8: tìm x:
a, 2019x(x-8)+x-8 =0
b, 4x^2+5x =6

Comments ( 2 )

  1. a, 2019x(x-8)+x-8=0
    2019x(x-8)+(x-8)=0
    (x-8)(2019x-1)=0
    TH1
    x-8=0
    x=8
    TH2
    2019x-1=0
    2019x=1
    x=1/2019
    Vậy x∈{8;1/2019}
    Cho mk xin hay nhất please
    Thank you

  2. Giải đáp:
    a  ????=8????=−12019  b  ????=34????=−2
    Lời giải và giải thích chi tiết:
    a  2019????(????−8)+????−8=0+x-8=0
    2019????2−16152????+????−8=0
    ????=8????=−12019
    b 4????2+5????=6
    4x^{2}+5x=6
    4????2+5????−6=0
    ????=34????=−2

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