令t=根号X -1 x=(t+1)^2 dx=2(t+1)dt 1≤t≤2
∫ (根号X)/(根号X-1) dx
= ∫ (1+1/( (根号X-1 )dx
= ∫ dx+ ∫(1/(根号X-1 )dx
=9-4+ ∫ (1/t*2(t+1)dt|(1,2)
=5+ (2t+2lnt)|(1,2)
=7+2ln2
令t=根号X -1 x=(t+1)^2 dx=2(t+1)dt 1≤t≤2
∫ (根号X)/(根号X-1) dx
= ∫ (1+1/( (根号X-1 )dx
= ∫ dx+ ∫(1/(根号X-1 )dx
=9-4+ ∫ (1/t*2(t+1)dt|(1,2)
=5+ (2t+2lnt)|(1,2)
=7+2ln2