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18.(本题满分1[文]2分)A+B=1解[章]析：（I)由图象可[来]知：-A+B=-3[自]7元12解得A=2[知],B=-1,2分1[嘛]2又由于号侣吾可得[答]7=，所以心2π=[案]2，由图像知f受-[网]1，sn2×号+)[文]=1，又因为骨名+[章]p2ππ所以2×2[来]+0=)，ps?4[自]分123所以f(w[知])=2sim(2x[嘛]+3）-1，6分([答])依题可得-T+2[案]kx≤2x+T≤T[网]+2kπ，解得23[文]2f(x)的单调递[章]增区间[5元+kπ[来]，128分1,π+[自]kπ]，k∈Z因为[知]xe[若引令r=2[嘛]x+号eD小，所以[答]nreo,10分即[案]g(x)的值域为[[网]-1，]：----[文]-12分
IA once misunders[章]tood by my teacher.L[来]uckily I dealt with the problempr[自]oper.Last[知] Monday.I foundwasp[嘛]roperlyLi[答]u Feng was very upset.I learned that he was worried about his parents relations[案]hip.They always quarreled[网] andparent[文]ssometime[章]s they even fought with each other.Out[来] of sympathy,[自]I wrote to tell him some ways I could try to dealhewit[知]h the problem,b[嘛]ut my teacher misunders[答]tood that I was doing and thought I was writing him a love letter.wh[案]atLater,I[网] realize that it wasn't necessary[文] for me to write at all.If many people knew about his problem,h[章]e wouldreal[来]izedmoreg[自]et the more help.I went to my teacher,t[知]old him the whole story.He said sorry to me and,under[嘛] his help,tell[答]ingwithwe[案] finally solved the problem.
