limx趋近于2 (√x-√2)/x-2=
问题描述:
limx趋近于2 (√x-√2)/x-2=
答
limx->2 (√x-√2)/(x-2)
=limx->2 (√x-√2)/(√x+2)(√x-√2)
=limx->2 1/(√x+√2)
=1/(√2+√2)
=√2/4