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2021人教版八年级数学寒假作业答案

发布时间：2021-04-25   来源：文档文库   
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2021人教版八年级数学寒假作业答案
20XX人教版八年级数学寒假作业答案 第1页第3页 1选择题 1A2D3A4C 2填空 (1T206h206Thh (2Q6x105pt6x105pQt0t6x105p (3S15b(40x70y550 3解答题 (1yQaxQa(0xa (2y802x 20 (32x3 当x3y有最小值为12 当2x0，y随x的增大而增大，当0x3，y随x的增大而减小 (4v80050t 0t16 当t8时，v80050x8400 当v100时，10080050t T14 第5页第7页 选择题 1B2C3C4B5B6A7B8D 填空 (11(2y2x11(3m2 (332x58y18 (4120x2 y3 1

(5y54x 2解答题 3(1略 (2依题意 kb5 2kb1 解得 k2b3 y2x3 当y0时 2x30x32 当x2时，2x4 则2x31 即y1 (3y会员卡03515 y租书卡05x 若y会员卡y租书卡 则035x15100 租书超过100天，会员卡比租书卡更合算 (4设A(mn 12x4xm6 m3 n2 A(32 y23xy23x4 (5y甲08x15X90012x900(x500 Y乙15x900x0615x540(x500 若y甲y乙 12x90015x540 2

x1200 当x1200选择甲厂 y甲12x20XX9003300 第17页第19页 1选择题 (1C(2D(3C 2填空 (1630(2017017(335(423818241292万 3解答题 (1 七大洲亚洲 亚洲和非洲 100 大洋洲 不能 (2一车间第四季度 一车间二车间 是图(1得出的是图(2得出的 (348025哪一个分数段的学生最多705805的学生最多。 第21页第23页 1选择题 (1B(2B(3C(4B 2填空 (120302525(2扁形361152度(3411 3解答题 (1 县ABCDEF 人口(万90 百分比12921103391110245 3

圆心角度数464773711408397882 (2图略 (3身高(cm频数 154515952 159516454 164516956 1695174510 174517955 179518453 (4图略结论：只有少数人对自己工作不满。 (520016略 第25页第27页 1选择题 (1B(2C(3A(4C(5B(6C 2填空 (1Dxxxx(2DECDED600 (3CADCD(4xxxx(5ADECAE 3解答题 (1DCE可以看作是ABF平移旋转得到的 AF不一定与DE平行因为AFE不一定等于D (2ABC1800x518500 C1800x318300 BCBAABC800 ABCABC AA300 BABC500 BBC1800BBCB500 (3略分别取各边中点两两连接即可 (4延长AD至E使ADDE连接BE 4

ADED D为BC的中点 在BDE和CDA中 BDCDADCBDEDEDA BDECDA BEAC AE AD 第29页第31页 选择题 (1D(2B(3B(4C 2填空 (16(2200(3BOCO(4ABDCACBDBC 3解答题 (1AECF AEEFCFEF AFCE CDABDEBFCEAF CDEABF DECAFB DEBF (2ABEACG ABDACF ABAC ABCACB BD平分ABC，CF平分ACB ABDACF BAFBAF ABAC 5

ABDACF (3BABC ABBC BB BEBD BEABDC (4 证明EHFHDHDHDEDF DEHDFH DEHDFH (5证明BCAECD BCAACEECDACE 即BCEACD ECDCBCAD BECADC BEAD BEAD仍然成立 证法同(1 第3335页 1选择题 (1A(2D(3D(4D 2填空题 (1EPPF(2角平分线角平分线上的点到两边距离相等。 (37cm(4500 3解答题 (1证明：作DEAB AD平分CAD DEABDCAC DCDE 6

C900ACBC B450 DEAB BEDB450 BEDE CAEDCADDAEADAD ACDAED ACAE ABAEBEACCD (2OD平分AOB 12 OBOA 12 ODOD OBDOAD(SAS 34 OD平分ADB PMBD，PNAD PMPN (3BEDCFD BDEFDC BDCD BEDCFD(AAS DEDF DEAB，DFAC AD平分BAC (4证明：作MNAD DM平分ADC CMCDNMAD
7
MCNM M为BC的中点 BMCM NMAD，BMAB 证明DE平分BC，DEBC CMBM NMAD，BMAB AM平分DAB (5DE平分BC，DEBC BECE AE平分BAC EFEG BECEEFEG BFECGE BFCG 第3739页 1选择题 (1D(2D(3D(4D(5B(6B 2填空题 (1完全重合对称轴另一个图形对称轴对应 (22角平分线(3700 (4xxxxxxxxXY 3解答题 (1(2(3(4(5略 第4143页 1选择题 (1C(2C(3B(4C(5B 2填空题 (1(2，3(2A(1，3B(1，1C(3，1 8

(3700，400和xxxx和200或500和500 (4350(51080 3解答题 (1AD平分BAC BADDAC300 ADBD BBAD300 C1800BBAC750 ADBDACC1100 (2ECDEACB600 CDCE CDEE300 BEBCCEAB12AC15 (3略 第4143页 1选择题 (1C(2C(3B(4C(5B 2填空题 (1(2，3(2A(1，3B(1，1C(3，1 (3700，400和xxxx和200或500和500 20XX2131705回复 chacouse 326位粉丝 3楼 (4350(51080 3解答题 (1AD平分BAC BADDAC300 ADBD 9

BBAD300 C1800BBAC750 ADBDACC1100 (2ECDEACB600 CDCE CDEE300 BEBCCEAB12AC15 (3略 第4547页 1选择题 (1A(2D(3D(4D(5B 2填空题 (124(2((ac(bc(32x3(46m6n (5abc(64(714 3解答题diyifanwencom (1有问题 (2n46n2 mn4m24 m24 m6或m2 12m22 m6(舍去 m2 (3原式7a22ab3a22ab 10a22b 原式a2ba2b2a2b1 1 原式3m24n2mnmn4m23n2 m2n2 10

(4原式a2ab3a3b 2a4b 当a3b2时 原式6814 2AB4x27x14 当x2时2AB4(227(21444 (5地砖面积4y4xxy2y2x 11xy 所需费用：11xya (6电脑原价1y85207y 2当y6800时原价6800858000(元 (7a10 B1021 1001 99 ab1099109 (83(2x23xy2x36(x2xy1 6x29xy6x96x26xy6 (15y6x3 3A6B结果分X无关 15y60 y25 第4951页 1选择题 (1C(2B(3B(4C(5C(6A(7B 2填空题 (1am(2mx(35353(4b5a12(5297(6121024 (74x2y6z2(81(92891(101027a3b3(1128a6(122 3解答题 11

(122223 26 (xy(xy(xy2 (xy4 (133x6y9 127x6y9 (a22b2 4a4b2 x8x8x8x8 0 (23x2x131 3x27 x9 (320XX4余2 320XX的末位数为9 (42nx3mx2n (5nn1(n1n (6n27nn2n6n为自然数 6n6n1也为整数 6n66n1该式的值能被b整除 (xa(xb x2(abxab abmx Ab36 m12 第5355页 1选择题 (1D(2B(3B(4C(5C(6C(7C(8C(9B 2填空题 12

(1x3y3(23a1(3x2(4x41(5100110019999 (69a2b2c2(72y2(87pq2(93(104m24m1(11x4a4 (12a2b22bcc2 3解答题 (1原式a3b3a2b2a4b8c2a9b12c2 原式3x2y23x3y6x3y43xy 原式a3a3a232a38a2a4a311a27 原式4m29n2 原式y49x4 原式(4x21216x48x21 (2原式(10003(10003xxxx 原式20XX20XX2(20XX1(20XX120XX (3原式x(yzx(yzx2(yz2x2y2z22y z(4全对 (5(xy2(xy24xy xy(2a2(2b2a2b2 (6(a1a2a21a22a1a a21a2(a1a2216218 (7(abc2a2b2c22ab2ac2bc (2xy3z24x2y29z24xy12xz6y z第5759页 1选择题 (1A(2C(3D(4D(5A(6C(7A(8A(9C(10D(11C 2填空题 (15C(23x2z(34103(415a3b2c(52(ab4(66x2y21(7(810(9a2b2 3解答题 (112x23x452x23xy32x2y5xy292(2xmnxmxn8516(39n32n232m4n132m34n3(3m213
三次
(32n23364327 (42x10(5a8a5a(6a(2511b(3411c(4311321164118111 x05a2321181116411a (7x12原式x3x3x41当X12时原式(12411716 x41 (8原式4a24a1当a34时 原式4(3424341 491631 942 14 第6163页 1选择题 (1C(2D(3C(4D(5D(6B(7D(8D(9D(10A(11A(12D 2填空题 (1(abc(2x(yx(3a2b2(42z(xyz(5my(6210(72xy(x2y2 (8(9(2a2bc(2a2bc(103ab(11abc13 3(1原式(4xyz232(4xyz3(4xyz3 原式9(ab22(ab2(9a9b2a2b(9a9b2a2b(11a7b(7a11b 原式3a(14a4a23a(2a12 原式(a2b22ab(a2b22ab(ab2(ab2 (2原式39x3739x3339(372739x10390 原式1999(291314(20001x2856002855972 原式(897896(8978961793 原式(97624210002xxxx (3原式4ab(ab(ab42x(4416 (4原式2x(x23x20 (5原式1x(1x(1x2(1x20XX 1x(1x1(1x(1x20XX 1x(1x20XXx20XX 14

120XXx(1x20XX (6原式(x222x2y2(y22 (x2y22 (xy(xy2 当x40y50 原式(90x102xxxx 20XX2131705回复 591721144楼 勒。。。。狠 20XX2141956回复 22264605楼 太强了，就不怕老师发现 这真的是一个加速剂哦(对某些人来说 20XX2151501回复 5848636楼 我真的十分感谢，此时心情无法形容，大恩不言谢 20XX2151611回复 chacouse 326位粉丝 7楼 怕什么，反正我上大学了 20XX2151746回复 yangxxxx 2位粉丝 8楼 (4350(51080 3解答题 (1AD平分BAC BADDAC300 15

ADBD BBAD300 C1800BBAC750 ADBDACC1100 (2ECDEACB600 CDCE CDEE300 BEBCCEAB12AC15 (3略 第4547页 1选择题 (1A(2D(3D(4D(5B 2填空题 (124(2((ac(bc(32x3(46m6n (5abc(64(714 3解答题 (1有问题 (2n46n2 mn4m24 m24 m6或m2 12m22 m6(舍去 m2 (3原式7a22ab3a22ab 10a22b 原式a2ba2b2a2b1 1 原式3m24n2mnmn4m23n2 16

m2n2 (4原式a2ab3a3b 2a4b 当a3b2时 原式6814 2AB4x27x14 当x2时2AB4(227(21444 (5地砖面积4y4xxy2y2x 11xy 所需费用：11xya (6电脑原价1y85207y 2当y6800时原价6800858000(元 (7a10 B1021 1001 99 ab1099109 (83(2x23xy2x36(x2xy1 6x29xy6x96x26xy6 (15y6x3 3A6B结果分X无关 15y60 y25 第4951页 1选择题 (1C(2B(3B(4C(5C(6A(7B 2填空题 (1am(2mx(35353(4b5a12(5297(6121024 (74x2y6z2(81(92891(101027a3b3(1128a6(122 17

3解答题 (122223 26 (xy(xy(xy2 (xy4 (133x6y9 127x6y9 (a22b2 4a4b2 x8x8x8x8 0 (23x2x131 3x27 x9 (320XX4余2 320XX的末位数为9 (42nx3mx2n (5nn1(n1n (6n27nn2n6n为自然数 6n6n1也为整数 6n66n1该式的值能被b整除 (xa(xb x2(abxab abmx Ab36 m12 第5355页 1选择题 (1D(2B(3B(4C(5C(6C(7C(8C(9B 18

2填空题 (1x3y3(23a1(3x2(4x41(5100110019999 (69a2b2c2(72y2(87pq2(93(104m24m1(11x4a4 (12a2b22bcc2 3解答题 (1原式a3b3a2b2a4b8c2a9b12c2 原式3x2y23x3y6x3y43xy 原式a3a3a232a38a2a4a311a27 原式4m29n2 原式y49x4 原式(4x21216x48x21 (2原式(10003(10003xxxx 原式20XX20XX2(20XX1(20XX120XX (3原式x(yzx(yzx2(yz2x2y2z22y z(4全对 (5(xy2(xy24xy xy(2a2(2b2a2b2 (6(a1a2a21a22a1a a21a2(a1a2216218 (7(abc2a2b2c22ab2ac2bc (2xy3z24x2y29z24xy12xz6y z第5759页 1选择题 (1A(2C(3D(4D(5A(6C(7A(8A(9C(10D(11C 2填空题 (15C(23x2z(34103(415a3b2c(52(ab4(66x2y21(7(810(9a2b2 3解答题 19
三次
(112x23x452x23xy32x2y5xy292(2xmnxmxn8516(39n32n232m4n132m34n3(3m2(32n23364327 (42x10(5a8a5a(6a(2511b(3411c(4311321164118111 x05a2321181116411a (7x12原式x3x3x41当X12时原式(12411716 x41 (8原式4a24a1当a34时 原式4(3424341 491631 942 14 第6163页 1选择题 (1C(2D(3C(4D(5D(6B(7D(8D(9D(10A(11A(12D 2填空题 (1(abc(2x(yx(3a2b2(42z(xyz(5my(6210(72xy(x2y2 (8(9(2a2bc(2a2bc(103ab(11abc13 3(1原式(4xyz232(4xyz3(4xyz3 原式9(ab22(ab2(9a9b2a2b(9a9b2a2b(11a7b(7a11b 原式3a(14a4a23a(2a12 原式(a2b22ab(a2b22ab(ab2(ab2 (2原式39x3739x3339(372739x10390 原式1999(291314(20001x2856002855972 原式(897896(8978961793 原式(97624210002xxxx (3原式4ab(ab(ab42x(4416 (4原式2x(x23x20 (5原式1x(1x(1x2(1x20XX 1x(1x1(1x(1x20XX 20

1x(1x20XXx20XX 120XXx(1x20XX (6原式(x222x2y2(y22 (x2y22 (xy(xy2 当x40y50 原式(90x102xxxx
21

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