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

Toán Lớp 8: 6x / x^2 -9 + 5x / x-3 + x / x-3

Toán Lớp 8: 6x / x^2 -9 + 5x / x-3 + x / x-3

Comments ( 2 )

  1. (6x )/( x^2 -9) +( 5x )/( x-3) + (x) /( x-3)(xne+-3)
    =(6x+5x(x+3)+x(x+3))/((x-3)(x+3))
    =(6x+5x^2+15x+x^2+3x)/((x-3)(x+3))
    =(24x+6x^2)/((x-3)(x+3))

  2. Giải đáp:
    {6x}/{x^2 -9} + {5x}/{x-3} + x/{x-3} 
    = {6x}/{(x – 3)(x + 3)} + {5x.(x + 3)}/{(x – 3)(x + 3)} + {x.(x + 3)}/{(x – 3)(x + 3)}
    = {6x}/{(x – 3)(x + 3)} + {5x^2 + 15x}/{(x – 3)(x + 3)} + {x^2 + 3x}/{(x – 3)(x + 3)}
    = {6x + 5x^2 + 15x + x^2 + 3x}/{(x – 3)(x + 3)}
    = {24x + 6x^2}/{(x – 3)(x + 3)}

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