英语周报九年级新目标xaq答案

One possible versionMy dear friendt's time to say goodbye. It's time to recall those beautiful days we spend together. Youare the most considerate person who knows exactly what I need and the very person whogives me a hand when necessarStill remember that night two years ago? When I suddenly fell ill, it was you whocarried me on your back to a nearby hospital. You took good care of me while I was having aninjection. Later, you managed to help me with my lessons. Without your help, I would havefailed in the examinationI still have hundreds of stories to share with you. I still have thousands of blessings foryou. May all your dreams come true! May our friendship last till the end of the universe

解:(1)当a=1时,g(x)=m(x+1其定义域为由g(x)>0,得-1 e-1所以函数g(x)的单调增区间为(-1,e-1),单调减区间为(e-1,+∞)(2)设F(x)=f(x)-(x+1)g(x)=e-2a-1n(x+a),由题意知F(x)有m个零点因为记A(x)=F(x),则h(x)=e+(x+a)2>0,知F(x)在区间(一a,+∞)内单调递增又因为F(0)=1-1<0,F(1)所以F(x)在区间(a,+∞)内存唯一的零点即F(x3)=e-x+于是当一a x时,F(x)>0,F(x)单调递增所以FF(x0)=e0-2a-ln(x0+0+-2a+x0当且仅当x0+a=1时,取等号由0 0,所以F(x)m=F(x0)>0,即函数F(x)没有零点,所以m=0的极坐标方程为pos0=-2

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