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

Toán Lớp 8: thực hiện phép cộng: `(3-x)/(x^2-1)+(2)/(x+1)` __________ không làm tắt.

Toán Lớp 8: thực hiện phép cộng:
(3-x)/(x^2-1)+(2)/(x+1)
__________
không làm tắt.

Comments ( 2 )

  1. {3-x}/{x^2-1}+2/{x+1}

    ={3-x}/{(x-1)(x+1)}+{2(x-1)}/{(x-1)(x+1)}

    ={(3-x)+2(x-1)}/{(x-1)(x+1)}

    ={3-x+2x-2}/{(x-1)(x+1)}

    ={x+1}/{(x-1)(x+1)}

    =1/{x-1}

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