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

Toán Lớp 8: 5 (3x+5) – 4 (2x-3) = 5x+3 (2x+12) + 1

Toán Lớp 8: 5 (3x+5) – 4 (2x-3) = 5x+3 (2x+12) + 1

Comments ( 2 )

  1. 5 (3x+5) – 4 (2x-3) = 5x+3 (2x+12) + 1
    ⇔ 15x + 25 – 8x + 12 = 5x + 6x + 36 + 1
    ⇔ 15x + 25x – 8x + 12 – 5x – 6x – 36  – 1 = 0
    ⇔ -4x = 0
    ⇔ x = 0
    Vậy nghiệm của phương trình S = {0}

  2. Giải đáp:
    5(3x+5)-4(2x-3)=5x+3(2x+12)+1
    <=> 15x+25-8x+12=5x+6x+36+1
    <=> 7x+37=11x+37
    <=> 7x=11x
    <=> 7x-11x=0
    <=> -4x=0
    <=> x=0
    Vậy phương trình có nghiệm S={0}

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

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