f(x)=[e^(ax)]/(x-2)
则:
f'(x)=[ae^(ax)(x-2)-e^(ax)]/(x-2)²
f'(x)=[(ax-2a-1)e^(ax)]/(x-2)²
(1)若a=0,则:f(x)=1/(x-2),此时函数f(x)在(-∞,2),(2,+∞)上递减;
(2)若a0,则函数f(x)在(-∞,2)上递减,在(2-(1/a),2)上递减,在(2,+∞)上递减.
f(x)=[e^(ax)]/(x-2)
则:
f'(x)=[ae^(ax)(x-2)-e^(ax)]/(x-2)²
f'(x)=[(ax-2a-1)e^(ax)]/(x-2)²
(1)若a=0,则:f(x)=1/(x-2),此时函数f(x)在(-∞,2),(2,+∞)上递减;
(2)若a0,则函数f(x)在(-∞,2)上递减,在(2-(1/a),2)上递减,在(2,+∞)上递减.