2022英语周报高一课标综合版10答案

was then promoted as taskmaster. After he had earned enough money, he became a bosseventually.After hearing his words, the boy thought a lot. Success can only be born in action. Workinghard is all winners shared and indispensable experience for achieving their dreams in their lives.Actually the contractors experience was just one good example to prove the truth of it. The boyknew that if he wanted to stand out among people, there was no shortcut or alternative but hardwork. Then he thanked the contractor for his reply and said goodbye to him. Leaving theconstruction site of the skyscraper he already had a firm resolution in his mind that he would starthis own journey right then in order to fulfill his dream in time【参考范文】The contractor told the boy that was also how he had got where he was then. Actually thebuilding contractor had once worked hard and outperformed others through his own constantefforts. If he had worn the same shirt just like other workers and hadn t devoted himself toworking, by no means would he have been noticed by his boss. As a matter of fact he wore his redshirt every day and worked arduously. Soon his day came. He obtained his bosss appreciation and

20.解析(1)因为f(x)=lnx-ax-,所以厂(x)2x ar 2由(x2=0得x=2或x=(2分)①当a>0时,因为f(1)=<0,不满足题意,…(4分)当a0时x)在(,.-a)上单调递减,在(-, )上单调递增,于是f(x)m 1 2≥0,解得-c≤a<0,所以a的取值范围为-e3≤a<0…(6分)(Ⅱ)函数g(x)=lnx x2-ax,定义域为(0, ∞),g'(x)2x2-ax 1因为x1,x2是函数g(x)的两个极值点,所以x1,x2是方程2x2-ax 1=0的两个不等正根,则有△=2-8>0,x1 =,x马得2,对称轴号号故x(2)-( (8分)且有ax1=2x 1,ax2=2r2 1,2g(x1)-g(x2)=2(hx1 x1-ax)-(hnx2 x2-ax2)=2(hx1 x2-2x2-1)-(lnx2 x2-2x2-1)-2x 2nx1-hx2 x22x2-2ln2-1.……………………………(10分)令t=x2,则t∈h(r=lnt-2h2-1,h(t)=1 13(2-1)(-1)2t2当()计A(D单调递减,当1∈(1, 2)时A()单调递增所以(1)==(1)=-1 4m2.所以2g(x1)-g(x2)的最小值为- 4hn……(12分)

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