experiencewas an excellent chance to learning team spirit.le书面表达One possible versionNoticeThis weekend our class will go to the city museum. We will start on Sunday morning and go there by busThe activity which is aimed to broaden our horizon will include enjoying the exhibitions in the museum.Besideswe will listen to the introduction of the history of our city given by the guideWhile visiting, remember to keep quiet. What's more, it is the rule not to take photos of the exhibitions. Itis a good chance to show our good manners.

21.(12分)解:(1)由题意,知f(1)=0,…分n..2分f(1)=-2,分所以函数∫(x)在点(1,f(1))处的切线方程为y=-2x+2.4分(2)g(x)=ef(x)=e(x-xz-xIn x)则g(x)=e(e(x+1)(x+lnx).………………………又x>0,故一e(x+1)<0令h(x)=x+lnx,则在区间(0,+∞)上h(x)=1+1>0恒成立,所以函数A(x)在区间(0,+∞)上递增又h1<0,h(1)=1>0,所以函数h(x)在(,1)上存在唯一零点6分故h(x0)=x0+lnx0=0,即x0=-lnxo.…………………………7分当x∈(0,x0)时,g'(x)>0,当x∈(x,+∞)时,g(x)<0,8分所以函数g(x)在(0,x0)上单调递增,在(x。,+∞)上单调递减,9分故g(x)≤g(xo)=eo(x0-x- toIn xo)

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