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

Toán Lớp 8: 3/2x + 3x-3/2x-1 + 2x^2+1/4x^2-2x

Toán Lớp 8: 3/2x + 3x-3/2x-1 + 2x^2+1/4x^2-2x

Comments ( 1 )

  1. Giải đáp:
    3/(2x)+(3x-3)/(2x-1)+(2x^(2)+1)/(4x^(2)-2x)     (ĐK : x \ne 0; x \ne 1/2)
    =[3(2x-1)]/[2x(2x-1)]+[2x(3x-3)]/[2x(2x-1)]+(2x^(2)+1)/[2x(2x-1)]
    =(6x-3+6x^(2)-6x+2x^(2)+1)/[2x(2x-1)]
    =(8x^(2)-2)/[2x(2x-1)]
    =[2(4x^(2)-1)]/[2x(2x-1)]
    =[(2x-1)(2x+1)]/[x(2x-1)]
    =(2x+1)/x

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