꼶𰸼ֱ һѡ 1 A 2 D 3 C 4 D 5 B 6 A 7 C 8 B 9 A 10 B
-73 -3, 19 -2, 91
16117 263441057190(6)
?11617.⣺1ԭʽ=5x22xy+xy+64x2=x2xy+6---------------------------3 x=2y=ʱԭʽ=4+1+6=11----------------------------------------------5 2ߣ2a1+|2a+b|=0|c1|=2a=b=1c=31----------------3 c=3ʱԭʽ=
-------------4֣c=1ʱԭʽ=-----------5
2
18.⣺1ãba0c---------------------------------------------2 2ͼ֪a0a+b0b+c0acΪ෴a+c=0
ԭʽ=ab+2a+b+c=a+c=0------------------------------------------------------6 19⣺ã = b2+bab=b2+abb2=ab------------4
2a=10b=4ʱԭʽ=20----------------------------------------6 20.⣺1ÿһĵ6ֱǣ363774-----------------------3
2ڶĵnΪ1n+1?n21--------------------------------5 ĵnΪ1n?2n2+2,-------------------------------------------7 3n=10ʱֱΪ100101202
ԣĺΪ100101+202=1-----------------------------------10
21.⣺1ӡˢշΪ0.2x+500Ԫ ӡˢշΪ0.4xԪ---------------------------------- --4 2ѡӡˢ ɣx=2400ʱӡˢΪ0.2x+500=980ԪӡˢΪ0.4x=960Ԫ
Ϊ980960ѡӡˢȽϺ㣮--------------------------------------------------7 (3)ѡӡˢɣx=2600ʱӡˢΪ0.2x+500=1020ԪӡˢΪ0.4x=1040Ԫ Ϊ10401020ѡӡˢȽϺ
-------------------------------------------------------------------------------------10 4ѧУӡˢѵĶӡˢϵġ------------------------12 0 x>2500ʱѡӡˢ㡣2500ݸ2֣ȹϵϸҪֻҪС2500ѡҼң2500ѡҼ3֣---------------------------------------------15 꼶ѧѧп һѡ⣨10С⣬ÿС3֣30֣ 1ک204ĸУСǣ A2 B0 C4 D 2и+3|4|+61.5Уĸǣ A1 B2 C3 D4 3ʮһŷɴɹ棬ھԼ390000Ĺ칬ŽԽӣ390000ÿѧʾӦΪ A3.910 B3.910 4 5 C3910 D0.3910 46 4иУȵһǣ A23멁23 B22루22 C3멁|3| D 루2 5мȷǣ Axy2xy=xy 2 2 2 B2a+3b=5ab Ca3+a2=a5 D3ab3ab=6ab 6xy+z෴ǣ Axyz Bx+yz Cy+zx Dx+y+z 7. ˵УȷĸУ ?aһǸ?aһ۵Ϊ?1ֵܾĺһÿһĺΪ0ôһһһ A.1 B.2 C.3 D.4 8ڶʽ0.3x2y2x3y27xy3+1˵ǣ Aʽʽ BĴϵ7 C1 DyΪ7xy2xy+0.3xy+1 9ABζʽA+Bһǣ Aζʽ Bʮζʽ CεĶʽ Dʽ 10ͼMNPRֱĸӦĵ㣬һԭ㣬MN=NP=PR=1aӦĵMN֮䣬bӦĵPR֮䣬|a|+|b|=3ԭǣ 3 32 2 AMR BNP CMN DPR ⣨6С⣬ÿС3֣18֣ 111.9583 ȷٷλ 12ʽabcϵ ʽ2b+ab5ab1Ĵ ϵ 13.֪|x|=4|y|=2y0x+yֵΪ 14820170.1252016= 15a3b=52a3b+3ba15ֵ 16aDzΪ1ǰ 2 23 4 2 11ΪaIJ磺2IJ??1?1IJǣ1?21?a11?֪a1?4 a2a1IJa3a2IJa4a3IJ?ƣ 1?(?1)2a2016= .⣺72֣ 178֣иӦ 5+0.62401.16.4777 1{ ?} 2{ ?} 3{ ?} 4{ ?} 18㣺ÿС4֣16֣ 121+1613 2255£ 3+ 18 |22 442+1| 19ÿС4֣8֣ 13x23x22x+1+4 2 22223a2b???2ab?2(?ab?4ab)???5ab,2 2 2 2 2 205֣Ȼֵ8ab+22ab3ab34ababa=2b=3