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

Toán Lớp 8: B=(15- √x / x-25+2/ √x+5) : √x-1 / √x-5

Toán Lớp 8: B=(15- √x / x-25+2/ √x+5) : √x-1 / √x-5

Comments ( 1 )

  1. Giải đáp+Lời giải và giải thích chi tiết:
    B=((15-sqrtx)/(x-25)+2/(sqrtx+5)):(sqrtx-1)/(sqrtx-5)(x>=0,x ne 1,xne25)
    =((15-sqrtx)/[(sqrtx-5)(sqrtx+5)]+[2(sqrtx-5)]/[(sqrtx-5)(sqrtx+5)])*(sqrtx-5)/(sqrtx-1)
    =(15-sqrtx+2sqrtx-10)/[(sqrtx-5)(sqrtx+5)]*(sqrtx-5)/(sqrtx-1)
    =(sqrtx+5)/[(sqrtx-5)(sqrtx+5)]*(sqrtx-5)/(sqrtx-1)
    =1/(sqrtx-1).

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