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Dear Sir or Madam,I am writing this letter to draw you attention to the community lecture concerning garbage classifica-yourtion.As we all know,garbage classification is of great significant for environmental protection.Wesignificanceshould try our best A make our community an better place.toGarbage classification not only benefits the environment,but reduce the workload of workers.Morereducesimportant it can help us develop a sense of responsibility and form good habits for ourselves.What'simportantlymore,the garbage where is classified can be recycled and turned intovalueresources.which/thatvaluableThe lecture will be held in the hall at 9 am next Sunday.I hope you can come and join in us.Making a contribution to garbage classification,please.MakeYours,Hongqi Community
17.【解析】(1)g(x)=2 sin@x(V5 cOSwx-sin@x+1=2sinxcos ox-2sinx+1=sin2ox+cos2@x=2sin(2ox+).32π因为最小正周期T==元，又0>0，所以o=1,即fx)=2sim2x+2,1分|2o所以令2x+受≤2+管≤2+受解得如+后≤<+，e2,所以)的单调送碳区间为：r+名k缸+经1，太eZ.2分3因为e0引时，2ar+君e后2g+名，)=5拾好有三个解，即(2)sin2or+马)=5恰好有三个解，627π20r.π8π所以≤3332分即13π20π15π1315，解得≤0<63641315所以实数)的取值范围是≤0<2分44
