【正文】 n the evening of 23, Lianping county city temperatures dropped to minus 2 degrees, a wide range of sudden rain sleet, before and after the provincial S341 line in Jiulianshan Mountain tunnel sections of the road appeared in the snow, lead to the passing vehicles skid, traffic is blocked. In the face of the sudden natural disasters, city and county highway department immediately launched the emergency plan for disaster prevention. As the front line of the main force, Lianping Highway Bureau of all Party members and cadres to remember the Party member responsibility, braving the biting cold wind, the first time rushed to the scene, on the icy pavement of salt disposal. Because the temperature is too low, just melt water immediately freezes, addition to the ice work to increase the difficulty. To ensure In addition to the re anization of the depths of the traffic safety, road people braved the icy put reflective cones and warning signs, endure cold at minus 2,3 of Jiulianshan patrols until one in the morning. Just before dawn, Lianping Highway Bureau personnel on the icy road salt ice melting processing until ten o39。 life is a simple, calm and peaceful. Always not to choose their own path and regret, life is like a train, the scenery and then the United States will retreat, the passage of time and encounter will eventually drifting further and further away, before is always himself. 25, everyone has a weakness, weakness is true humanity. That has no weakness, a shallow person. That people think there is no weakness, mostly false. Life has shortings, there are shortings is the real life. That no one regret, or childish or numbness or Self deception. It is in tolerance of weakness and so on to accept, people live happily. Hello, everyone! I am a party member. The title of my speech is: study and implement the party39。t wait for old just miss. Time to return, seize every moment, again painstakingly again tired also Those struggling to fly. 23, life could not Yimapingchuan, even flat pavement, inevitably there will be a few pieces of roadblocks. Some of the rocks around the past, while others have to move it out. Just move others put the stone is very easy, because the stone from the appearance we can discern。 to get, must work to。 how do you treat people, does not represent how others treat you, if cannot see through this point, only inviting worry. 18, time is like a sponge in the water, as long as you are willing to squeeze, the total water is still there. Every life, after the ups and downs The best test of live, to life, survival and continuation, do not stop the struggle in the joys and sorrows of life on the road, so that different soul to bear life beat, acceptance of suffering. 19, indifferent to heart, calmly in table, elegant and fortable life, do not take what is so important. The pursuit will be disappointed。t envy him A sum of, don39。t envy who. Like a person is a kind of feeling, not like a person is true. The truth is easy to explain, I feel Is unspeakable. The best travel life is that you in a strange place found a long lost touched. 11, happy life not in the bustling in, and in the peace of mind。 you pain, no one can understand. Then you only tears to smile. 8, each people have youth, Each youth are a story, the life of the world never gets easier, I want what, wish the world all know, as has been the same。 and when we are in a negative state of mind, you will find many depressed things。t be narrowminded. Poke to care, is a kind of openminded, a free and easy. 5, I am not afraid of others behind me a knife, I afraid to look back and see stab me, is my intention to treat people。 not unrewarding perfunctorily, but calm attitude of life of unrestrained selfconfidence. Plain living, there is no noise noisy, no earthly troubles, more did not fill in the discontent of desire, some just a calm, a calm. 3, memory of heart will not good things to erase the, life is a When no movie, pain is a beginning, the struggle is a kind of process, death is a kind of ending. Give up this giving up is the helpless, do not give up the abandoned, do not give up this giving up is ignorance, do not give up should not give up is persistent. 4, a thing figured is heaven, think impassability is hell. Since the living, to live better. Sometimes we because of too narrowminded, too care around the chores and penny wise and pound foolish, not worth the candle. Some things to attract trouble and worry, pletely depends on how we look at and deal with it. Don39。 to implement , do not want to, dare not, not with disciplinary ruler to supervision。 (II)若 ( , )2???? ,且 22f ? ?（ ） ,求 ? 的值 . 【答案】 解 :(I)因為 2 1( 2 c os 1 ) sin 2 c os 42f x x x x? ? ?（ ）= 1c os 2 si n 2 c os 42x x x? = 1 (si n 4 cos 4 )2 xx?= 2 sin(4 )24x ??,所以 ()fx的最小正周期為2?,最大值為 22. (II)因為 22f ? ?（ ）,所以 sin(4 ) 14?? ??. 因為 ( , )2????, 所以 9 174 ( , )4 4 4? ? ?? ??,所以 5442?????,故 916???. 41． （ 2020 年上海高考數(shù)學(xué)試題（文科）） 本題共有 2個小題 .第 1小題滿分 6分 ,第 2小題滿分 8分 . 已知函數(shù) ( ) 2 sin( )f x x?? ,其中常數(shù) 0?? . (1)令 1?? ,判斷函數(shù) ( ) ( ) ( )2F x f x f x ?? ? ?的奇偶性并說明理由 。(2) 若 C=23? ,求 ab 的值 . 【答案】 解 :(1)由已知得 sinAsinB+sinBsinC+12sin2B= sinAsinB+sinBsinC=2sin2B 因為 sinB 不為 0,所以 sinA+sinC=2sinB 再由正弦定理得 a+c=2b,所以 a,b,c成等差數(shù)列 (2)由余弦定理知 2 2 2 2 c o sc a b ac C? ? ? 得 2 2 2 2( 2 ) 2 c o s3b a a b a c ?? ? ? ?化簡得 35ab? 38． （ 2020 年 高 考湖 北卷 （文）） 在 △ ABC 中 ,角 A , B , C 對應(yīng)的邊分別是 a , b , c . 已知c o s 2 3 c o s ( ) 1A B C? ? ?. (Ⅰ) 求角 A 的大小 。fx?ab . (Ⅰ) 求 f (x)的最小正周期 . (Ⅱ ) 求 f (x) 在 0,2???????上的最大值和最小值 . 【答案】 (Ⅰ) () (Ⅱ) 若 a=6,b+c=8,求 △ABC 的面積 . 【答案】 解 :(Ⅰ) 由已知得到 : 2 s in s in 3 s inA B B?,且 3(0 , ) s i n 0 s i n22B B A?? ? ? ? ?,且 (0 , )23AA??? ? ?。 26． （ 2020 年高考江西卷（文）） 設(shè) f(x)= sin3x+cos3x,若對任意實數(shù) x