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

Toán Lớp 8: tính: (x/x^2-4 + 2/2-x + 1/x+2).(x+2/2)

Toán Lớp 8: tính:
(x/x^2-4 + 2/2-x + 1/x+2).(x+2/2)

Comments ( 2 )

  1. (\frac{x}{x^2-4}+2/{2-x}+1/{x+2}){x+2}/2$\\$=(\frac{x}{x^2-4}-2/{x-2}+1/{x+2}){x+2}/2$\\$=\frac{x-2(x+2)+x-2}{(x-2)(x+2)}.{x+2}/2$\\$=\frac{x-2x-4+x-2}{(x-2)(x+2)}.{x+2}/2$\\$=\frac{-6}{(x-2)(x+2)}.{x+2}/2$\\$=-3/{x-2}

  2. Giải đáp + Lời giải và giải thích chi tiết:
     (x/(x^2-4) +2/(2-x) + 1/(x+2) ) .(x+2)/2
    đk:x $\neq$ +-2
    =(x/((x+2)(x-2)) – 2/(x-2) + 1/(x+2) ) .(x+2)/2
    =(x-2(x+2)+x-2)/((x+2)(x-2)) . (x+2)/2
    =(x-2x-4+x-2)/((x+2)(x-2)) . (x+2)/2
    =(-6)/((x+2)(x-2)) . (x+2)/2
    =-3/(x-2)

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

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