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

Toán Lớp 8: 3/2x+4 + x+8/x^2-4 Giúp mình câu này với ạ, mình cảm ơn nhiềuuuu:3

Toán Lớp 8: 3/2x+4 + x+8/x^2-4
Giúp mình câu này với ạ, mình cảm ơn nhiềuuuu:3

Comments ( 2 )

  1. 3/(2x+4)+(x+8)/(x^2-4)
    =3/(2(x+2))+(x+8)/((x-2)(x+2))
    =(3(x-2))/(2(x+2)(x-2))+(2(x+8))/(2(x-2)(x+2))
    =(3x-6+16+2x)/(2(x-2)(x+2))
    =(5(x+2))/(2(x-2)(x+2))
    =5/(2(x-2))

  2. 3/(2x+4) + (x+8)/(x^2-4)
    =3/(2(x+2)) + (x+8)/((x-2)(x+2))
    =(3(x-2)+2(x+8))/(2(x-2)(x+2))
    =(3x-6+2x+16)/(2(x-2)(x+2))
    =(5x+10)/(2(x-2)(x+2))
    =(5(x+2))/(2(x-2)(x+2))
    =(5)/(2(x-2))

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