(1+2的-1/x次方)/(1-2的-1/x次方),当x趋近于0的左右极限

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(1+2的-1/x次方)/(1-2的-1/x次方),当x趋近于0的左右极限

(1+2的-1/x次方)/(1-2的-1/x次方),当x趋近于0的左右极限
(1+2的-1/x次方)/(1-2的-1/x次方),当x趋近于0的左右极限

(1+2的-1/x次方)/(1-2的-1/x次方),当x趋近于0的左右极限
x→0-时,
-1/x→-∞
2的-1/x次方→0
lim(1+2的-1/x次方)/(1-2的-1/x次方)=1/1=1