2021年广东省中考数学仿真模拟试卷（二）（附答案详解）

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2021
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23■•.S=^AB-(BC+DE),vAB=6cmBC=8cm,DE=6cm,f1•S=2x6x(8+6)=42(cm2).ூ᪆௃(1)᝞¥ᵬᡠDÔPᙠØÙCQÇ■ÎÔḄÛÜAABPḄ☢§SÝᢝߺ.ᦑᫀCD6EF(¥ᵬ)(2)à_áPᙠBC#0AB9âḄ>ᙠßjãᜧᑮÕC#äåߺᵫ©c¿¥,PᙠBC³ÔH4Ð34BC=4x2=8cm.ᙠC஺³ÔH2ÐCD=2x2=4cm,ᙠOE³ÔH3ÐDE=3x2=6cm,æAB=6cm,34EF=AB-CD=2cm,ᦑᫀ8c54C7஻6cm2cm(3)çᫀ;(4)çᫀ.ூᑖ᪆௃(1)ᔠ¥ᵬ]0éê(2)᪷&ëᦪ¥¯]ᑨjh8CஹCDஹDE,EFḄíî(3)᪷&®¯Ḅ☢§±²°oeÏg(4)ͳÔᑮE#☢§Õᑮᨬᜧ.᪷&®¯Ḅ☢§°oeϱ².⚪ὃnHÔ⚪Ḅëᦪ¥ï⌕ð᪷&ëᦪ¥ïḄឋòÇ¥ïḄᦪ&ᑖ᪆hëᦪḄóôÇᡠ◤⌕Ḅᩩöᔠ÷▭'ùᑮḄú.©24⚓ᐳ39⚓

2427.ூᫀ௃(0,4)ᡈ(0,0)403#h=t-l,ᑣ4(t-1)=12,.•"=4,ᦑCḄᙶ᪗9(0,4)át<1#h=3-t,ᑣ4(3-t)=12,••.t=0,ᦑCḄᙶ᪗9(0,0)ᦑᫀ9(0,4)ᡈ(0,0)ঝ᪷&⚪'a=4,hḄᨬü91,c4ஹBஹCḄ“þ☢§”Ḅᨬ4x1=4ᦑᫀ4(2)ᑖIஹt>4S=(C+1)x2C=2/+23•S>40IIஹ25জ£>ஹEஹFḄ“☢”"ᨬᨬ15,#ᓃ0

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27f.ூ?௃?ëç]Ḅᦪ360஺+30஺=12,ᦑ⌱஺.33.ூᫀ௃Dூ?᪆௃?x=2òᐭXY2x—a=6A4—a=6,?Aa=-2,ᦑ⌱x=2òᐭX2x-a=6AT4-a=6,>TXYḄ?ᓽ@.Z⚪ὃbc?ᐗùXY¼ᐗùXYḄ?úATᐵ஺ḄᐗùXY[?⚪Ḅᐵf.34.ூᫀ௃Aூ?᪆௃?}üy=—2x+3þyÝᔣ
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ᑖ.36.ூ?ᫀ௃Cூ᪆௃•••ᙠjABCkZ.BAC=45°,4(7=15°,•••/.ABC=180°-^BAC-NCr180°—45°-15°=120°,•sjABC@%A⌮u┐wxahz(00,ᑣabc<0,ᦑ78ঝᵫ,W=3uy=9a+3b+c<0,ᦑ78ঞT=2,¢b=-4a,=1uy=a+b+cV0,—3a+cV0,-a>f,ᦑ78ট¥¦§a/+¨©+c=0ª᪷©2ᵫ,W0VV1,3V%2V4,¢ᑣ2V|%i2IV%ᦑ┯°ᦑ⌱:A,

29জᱥgᙠ)ᑣ²(c>0,ᓽ,_ঝx=3uy=9a+3b+c<0,ᓽ,_ঞᵫgx=1uḄᦪ³Ḅ´ᓽ,_ট᪷Sᓽ,_.e⚪0⌕ὃ34¢ᦪµ¶ᦪḄᐵ¶ᱥµxḄ·¸¹ᑮ᪷µ¶ᦪḄᐵ¶ᦪEᔠ;⚪Ḅᐵ=.38.ூ?ᫀ௃ab(a-1)ூ᪆௃»=ab(a-l).ᦑ?ᫀab(a-l).¼½¾¿Ḅᓽ,)*?ᫀ.e⚪0⌕ὃ34¿ᑖ-¼½¾¿78¼½¾¿;Àe⚪Ḅᐵ=.39.ூ?ᫀ௃xS1ூ᪆௃⌕ÁµᨵÄÅÆU1—XN0,)x<1,ᦑ?ᫀ%<1.᪷S¢᪷ᨵÄÅḄᩩÈᑡ*ÊÊ)ᑮ?ᫀ.e⚪ὃ3Ḅ;¢᪷ᨵÄÅḄᩩÈËÌ¢᪷kḄÍΦᦪ;ÏÐᦪ;⚪Ḅᐵ=.40.ூ?ᫀ௃6ூ᪆௃•.ᦪS—2,0,4,x,6,8Ḅkᦪ5,4+xL••B—=5,)x=6,ᡠÒÓÔᦪS2,0,4,6,6,8,ᡠÒÕᦪ6,ᦑ?ᫀ6.ᐜ᪷SkᦪḄᭆ×ᑡ¦§_*xḄ³[ᵫÕᦪḄÅᓽ,)*?ᫀ.b30⚓ᐳ39⚓

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