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

Toán Lớp 9: B=((15-√x)/(x-25)+2/(√x+5)):(√x+1)/(√x-5)

Toán Lớp 9: B=((15-√x)/(x-25)+2/(√x+5)):(√x+1)/(√x-5)

Comments ( 1 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
     Với x≥0;x\ne25
    B=((15-\sqrtx)/(x-25)+2/(\sqrtx+5)):(\sqrtx+1)/(\sqrtx-5)
    =((15-\sqrtx)/((\sqrtx-5)(\sqrtx+5))+2/(\sqrtx+5)):(\sqrtx+1)/(\sqrtx-5)
    =(15-\sqrtx+2(\sqrtx-5))/((\sqrtx-5)(\sqrtx+5)):(\sqrtx+1)/(\sqrtx-5)
    =(15-\sqrtx+2\sqrtx-10)/((\sqrtx-5)(\sqrtx+5)).(\sqrtx-5)/(\sqrtx+1)
    =(\sqrtx+5)/(\sqrtx+5).(1)/(\sqrtx+1)
    =1/(\sqrtx+1)
    Vậy với x≥0;x\ne25 thì B=1/(\sqrtx+1)

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

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