2020年武汉市部分学校九年级元月调考数学试卷答案解析

1、2 2 2 2 2 2 2 2 2 2 2 2 2 2 2020 年武市部分校九年元月调数学试参考答与题解析一选题共 10 小）1 x4x A51 B4 4 D51 x 145x 4x10 42 ABCD C D 1803 y2 2x ACB y D yx y y2x y 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 y2 yx 4 4 3 A 1 C 2 B 1 D 4 2 3 5 5 P O A P B P O C P D P d P d 35d P 6 yx x A 1 2 B 2 C 2 D 1 2 0 0 2 x x+3x+1 +212 y x 0 yx 1 2 7

2、ABC C eq oac(,A) eq oac(, )BC B ABCA43 A36B37CD39ABC eq oac(,A) eq oac(, )BC B BA2843B BCB C eq oac(,A) eq oac(, )B A BA2843AACBB+BCA71CBBB71BCB38 388 ABCD 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 7 9 x +4 n 2 A16 B14 C10 6 n + +4 2n mn m 2 +4 mn m m+n mn+8 m+1mn4n x x4 n n4 n n +x4 nmn42 mn22n+422mn

3、1410ABC A6030 A B O ABCD BM O O OH H CH OH OCCH BM O T OTOA O HCHB60 OA OAAHOH BMACT90 CH OCOHCH OC 二填题共 小题2 12 y 2212 10 300 100 20 2 2 2 2 2 2 2 2 100 x2013 O 100BCD 130 A ABCD BC200 872 +2001+x 872 872 x200+200 x+200 872200+2001+2001+ 15 ax +bxc0 12 2 04+2+c0acb+ a 0 b 0 x2 +2+ abatb

4、 0 y ab b0 x124+2+c+2+c04+2+c0 x 1 y acb0 + x1 t1 +c+bc a+batb 2 2 2 2 2 2 2 2 16 C R C1.41424 3.11 0.01 2.449 AOBOAOB + AOB30OB+ H AH OA OH 12224 24AH 217 x xm0 m 40 m m eq oac(,2) 4 m1 x +2+10 1 218AC 1 O OBAOBBOC OB OABC OBOCAOBBOC AOBBOC60AOC 19 1 1 5 1 2 5 2 2 bcd 2 2 2 bcd abadcd10 adbccdbd6 P

5、 20 1 P 2 2 3 3ABC OD ABC 23 AC CQAQ BQ AC O PO 2 2 AP 3 3 OD AC Q BQ 21 O AB O OP AB D O E DE1ABCPDA2 OB AAS ABC 2 OE BE JBDE O B PBOAOBOP OAP90ADP90AC ABCADPCABDAPCAB90 ACBAPABCPDAAAS2 OE BE OP APCAP90ACP45OCOEOCE45COECAPOCPEABECBBECCEBPEJASAEJACE45DBJDJB45BDJEJDE 2 2 2 2 2 2 2 2 2 2 2 2 2 2 22 1x

6、30 x+401002 20 y 1 2 2250 3 2400 21 y2250 3 2400 1 2400 yx+402x +60+2000302 2250 22502x +60 x 300 1 52 25 25 2250 3y2x +60+2000 x15 +2450 y2400 2400 x15 +24502x15 50 1 10 x 1020 11 2400 231 BCCDBADBCD90AC BAD ABC C 90 2 ABCDE A90DE BD eq oac(,Rt) D ADABBD AD A BGBE DGDE BDG BDE D AB AP 5 ACPBCQ 12a

7、PQ PCa D AB 1 AD AD F DF CF CDF ABC 90 ABCD BADBCD90BADBCDABCADCADCCDFABCCDFCDABCFDCSASBACDFCCAFCFDBACDACAC BAD DC DC F CG BG ABCDBCG90AABBCGSAS+DECGCDDGDEBDEBDEBD CDE D AB 3 CP Q CQ ABaAB13AD10 P AD AP AD5ADAPD90ACB90180CBPCAPCBPCBQCAPCBQACPBCQSASCQACPBCGPCQ+BCQPCBACPACB90 eq oac(,Rt)ABP +aa17a12a eq oac(,Rt) PCPQa D AB 4BD AD AD AD90ACB CBPCAP CH PCH90ACBBCHACPCBHCAPASA ABm m ADm m eq oac(,Rt) BH mm 24 m+4 x F1 1y P m1x2 P 2 m 3 F y x+3 1 y2 F 1 2 1 x x2 y 2 xy2m+4PB y 3 m F 2 2 22 2 2 2 2 2 2 2 22 2 2 2 2 2 x+