2021-2022学年湖南省张家界某中学中考冲刺卷数学试题含解析

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2021-2022
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15
3+EB=EO=x,ᑣCE=-m-x,ᙠRtACOEP᪷AõöVᳮᑮËm-x2+n2=x2,_²5_ùஹFË+ஹNù᪷AP5¶wᑮEFḄP5*Ëùû_ùஹËO_ùüᐭP,__O,67zT----TzT—=]JJJJLvJJ.m2=2i?ÿ
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17ঞ345678589(20+x)ᔴ;ᦑ=ᫀ(100-x)(1-x)(20+x).(II)?⚪AᨵCᵬ567A589xᔴ,ᑣᵬ56ᑮB5(100-x)ᔴ,4567A5(1-x)ᔴ,456ᑮ85(20+x)ᔴ.x>0100-x>0ᑣ%0H1.60-x>020+x>03ᵬ567A589xᔴI,J6K:j=12x20x+10x25(100-x)+12x15(1-x)+8x20x[120-(100-x)]=-30x+39000•.•34567A589(1-x)ᔴ,A00,.*.j=-30x+39000(0

18
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19ZDAC=ZACB=45°=ZFAE,•EF=EC45ÝR7t;•EFḄÖÜ1802%R=2,*fM⚪⌕ὃᙊᑁḄ☢á,⚪ḄᐵZÔ´Ḅឋ¿ஹᑗÒḄឋ¿ஹÕÖ¬ᡧ☢áḄ.25ஹ4ூ᪆௃ãfäåæᔠç%ᑮᨬè,éacbḄYêᐭᓽY;ூ¶௃JM^=a2-3ab+a2+2ab+b2-a2+ab=a2+b2,Va=l>b="íI,2ãf=M+(-i)221=1+-4_5_—.4ூ]^௃ὃ᦮fḄ|T-ᓄèY,Á¬ïðᦪḄឋ¿,6}ᑣZ_⚪Ḅᐵ.26ஹñ¨(1)1,60°(2)273;òó(I)Ûᑗ,ᳮᵫ¶õ᪆;(2)45°;30°;(3)0஺<(1<30஺ᡈ45°

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