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

Toán Lớp 9: A = ((a+2√a)/(√a+2)-1):((a-√a)/(√a-1)+1) B = (√x/(√x-1)-1/(x-√x)):(1/(√x+1)+2/(x-1)) làm hộ mik vs

Toán Lớp 9: A = ((a+2√a)/(√a+2)-1):((a-√a)/(√a-1)+1)
B = (√x/(√x-1)-1/(x-√x)):(1/(√x+1)+2/(x-1))
làm hộ mik vs

Comments ( 1 )

  1. Giải đáp:+Lời giải và giải thích chi tiết:
    A=((a+2\sqrta)/(\sqrta+2)-1):((a-\sqrta)/(\sqrta-1)+1)
    =( (\sqrta(\sqrta+2))/(\sqrta+2)-1):( (\sqrta(\sqrta-1))/(\sqrta-1)+1)
    =(\sqrta-1):(\sqrta+1)=(\sqrta-1)/(\sqrta+1)
    B=(\sqrtx/(\sqrtx-1)-1/(x-\sqrtx)):(1/(\sqrtx+1)+2/(x-1))
    =(\sqrtx/(\sqrtx-1)-1/(\sqrtx(\sqrtx-1))):(1/(\sqrtx+1)+2/((\sqrtx+1)(\sqrtx-1)))
    =(x-1)/(\sqrtx(\sqrtx-1)):(\sqrtx-1+2)/((\sqrtx+1)(\sqrtx-1))
    =((\sqrtx+1)(\sqrtx-1))/(\sqrtx(\sqrtx-1)):(\sqrtx+1)/((\sqrtx+1)(\sqrtx-1))
    =(\sqrtx+1)/\sqrtx : 1/(\sqrtx-1)
    =((\sqrtx+1)(\sqrtx-1))/\sqrtx = (x-1)/\sqrtx

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