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

Toán Lớp 8: tìm x : a, (2x+3).(x-4)+(x-5).(x-2)=(3x-5).(x-4)

Toán Lớp 8: tìm x :
a, (2x+3).(x-4)+(x-5).(x-2)=(3x-5).(x-4)

Comments ( 2 )

  1. Giải đáp:
     x=22/5
    Lời giải và giải thích chi tiết:
    (2x+3)(x-4)+(x-5)(x-2)=(3x-5)(x-4)
    <=>(2x+3)(x-4)+(x-5)(x-2)-(3x-5)(x-4)=0
    <=>(2x^2-8x+3x-12)+(x^2-2x-5x+10)-(3x^2-12x-5x+20)=0
    <=>2x^2-8x+3x-12+x^2-2x-5x+10-3x^2+12x+5x-20=0
    <=> (2x^2+x^2-3x^2)+(-8x+3x-2x-5x+12x+5x)-20-12+10=0
    <=>5x-22=0
    <=>x=22/5
    Vậy x=22/5

  2. (2x+3)(x-4)+(x-5)(x-2)=(3x-5)(x-4)
    <=>2x^2-5x-12+x^2-7x+10=3x^2-17x+20
    <=>3x^2-12x-2=3x^2-17x+20
    <=>3x^2-3x^2-12x+17x=20+2
    <=>5x=22
    <=>x=22/5
    Vậy x=22/5
     

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

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