2022-2023学年高三上学期开学考试文科数学试题

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6Z/(x)=2cos2xḄᔣ]^_ᓫ`(12/(x)=2cos(2(x+/))=2cos(2x+^)=2sin=2sin(§—2x)=—2sin(2x—.ᦑD⌱⚗ab.ᦑ⌱cD.7.Bூᑖ᪆௃᪷ghi(A,BḄᜳklm2Ḅᜳkno,pqi.ூ௃ᵫ10=?2(,sMcos@5)=s.t▭(v2),wx@ab,c,,ᙳ@ᓫ`ᔣz,ᡠ|aBḄᜳklm7Ḅᜳkno,}hP,஺⚪ᨵJ_@⚪,ᦑឤ@⚪Ḅ஺vq.ᦑ⌱cB.8.Aூᑖ᪆௃ᵫ|?oᓽiᨬ.ூ௃x@cos2a>0,=f——1——-}+cos2a>2.——I-cos2a-2=*.EE——=cos2a=>cosa=±-N,19cosb9)ஹ9cos2a999cos2a3o.ᦑ⌱cA9.Dூᑖ᪆௃i(/(x)@STᦪ,/প=0,i஻x)<0஻x)>0Ḅ,ᔠ(Ḅ᜻Ꮤឋiᓽ.

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ᵫ⚪P¸=2,£2஽-஺£஽!¹¤=0,HAᔠA>C4q=2,c=l,H᪷0cdEᳮfOᓽ3.(1)O*ᵫ⚪2843஻c=2/?2,2஻+2஺2=5ac.532,22-ac——ac7Da+c-b22=1cosB=--------------=-------------2ac2ac~2.,Bw(Oಘ,••»(2)O*Aᔠ(1)W-3«c=2h2,2a2+2c2=5ac,

13H¼஺=GIᐭl8^ac=2,2a2+2c2=5ac.:.(2a-c)(஻-2c)=0.=cÁ8O4a=l,c=2x஻=2cÁ8O4c=La=2.ÅA>C,.a>c,...a=2,c—\.219.(1)O᪆ফ2ூᑖ᪆௃(1)᪷0☢☢ᚖÍḄឋÏ34CO8\☢84஺8H᪷0$☢ᚖÍḄᑨEឋÏÔ48☢CEMᓽ3x(2)᪷0qឋÏEᑮAC஺ḄSTC,BᑮAC஺ḄSTḄ\ᙳo8HAᔠ(1)qÙ_1_☢C7MfOᓽ3.(1)*§\☢Ô4஺_L\☢BCD,ÝÞ80,CD±BD,CDu\☢BCD,ᦑCD_L\☢54/).8Au\☢840,ᦑCDJ-84.ADC\CD=C,4஺,஺£ãä\☢4஺8x._1☢஺஺4§ACu☢CD4,:.AB±AC(2)᪷0qឋÏ8PEᑮACDḄSTC,BᑮACOḄSTḄ\ᙳo.;

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15ᡠFb=l,
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4᦮ᳮᓽᫀ.(1)Y+஻+c],4b,c!"ᦪa+b+&=4(a+b+&)2<^(l2+12+l2)(a2+Z?2+c)=G

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