1⼀根号x-1dx=?求解

2024-12-19 17:33:43
推荐回答(2个)
回答1:

∫[[1/(√x-1)]dx

=∫[2√x/(√x-1)]d(√x)
=∫[(2√x-2+2)/(√x-1)]d(√x)
=∫[2 +2/(√x-1)]d(√x)
=2√x+2ln|√x-1| +C
选B

回答2:

let
u=√x
du = dx/(2√x)
dx = 2u du
∫ dx/(√x -1)
=∫ 2u/(u-1) du
=∫ [2 + 2/(u-1)] du
=2u +2ln|u-1| +C
=2√x + 2|√x-1| +C
ans : B