当x趋近于1时求(根号下(5x-4)-根号下x)/(根号下(x加3)-2)
=当x趋近于1时求(根号下(5x-4)方-根号下x方)(根号下(x加3)+2)/(根号下(x加3)方-2方)(根号下(5x-4)+根号下x)
=lim(x->1) (4x-4)(根号下(x加3)+2)/(x-1)(根号下(5x-4)+根号下x)
=4lim(x->1) (根号下(x加3)+2)/(根号下(5x-4)+根号下x)
=4×（√4+2）/(√1+√1)
=4×4÷2
=8
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