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

Toán Lớp 8: 4x^2 – x= 0 x(x-1)-x+1=0 Giải pt

Toán Lớp 8: 4x^2 – x= 0
x(x-1)-x+1=0
Giải pt

Comments ( 2 )

  1. 4x^2-x=0
    x.(4x-1)=0
    TH1
    x=0
    TH2
    4x-1=0
    4x=1
    x=1/4
    x.(x-1)-x+1=0
    x.(x-1)-(x-1)=0
    (x-1)(x-1)=0
    (x-1)^2=0
    x-1=0
    x=1

  2. Giải đáp:
    1, x = 0; 1/4
    2, x = 1
    Lời giải và giải thích chi tiết:
    1, 4x^2 – x = 0
    <=> x(4x – 1) = 0
    <=> x = 0; 4x – 1 = 0
    => x = 0; x = 1/4
    2, x(x – 1) – x + 1 = 0
    <=> x(x – 1) – (x – 1) = 0
    <=> (x – 1)^2 = 0
    <=> x – 1 = 0
    => x = 1

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

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