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

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

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

Comments ( 2 )

  1. Giải đáp:
     
    Lời giải và giải thích chi tiết:
     2(x-1)”2+3(x-2)”2=5(x+2)(x+1)+4
    =2-x-1″5 x -2 = 5 – x + 1 + 4
    = 2-1-x+1+4
    =2-1+1+4 
    = 6+x
    = 6

  2. 2(x-1)^2+3(x-2)^2=5(x+2)(x+1)+4
    <=>2(x^2-2x+1)+3(x^2-4x+4)=5(x^2+x+2x+2)+4
    <=>2x^2-4x+2+3x^2-12x+12=5x^2+5x+10x+10+4
    <=>2x^2-4x+2+3x^2-12x+12-5x^2-5x-10x-10-4=0
    <=>x=0
    Vậy x=0

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

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