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令f(x)=lgx+2x-8則可知函數f(x)在(0,+∞)單調遞增,且函數在(0,+∞)連續∵f(1)=-6<0,f(2)=lg2-4<0,f(3)=lg3-2<0,f(4)=lg4>0∴f(3)f(4)<0由函數的零點判定定理可得,函數的零點區間(3,4)∴k=3故選:B
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