【正文】
,+:設(shè)酒瓶下部圓柱的底面面積為S,則酒瓶容積為aS+(hb)S, 、圓錐、圓柱、四面體、直三棱柱、分別為6 250 cm3和7 、橢圓、 .(2)1 :設(shè)電線桿根部為P點(diǎn),ABBM=OPPM,CDND=OPPN,EFGF=OPPG,GF為EF的影子,可得PM=10 m,OP=10 m,GF=1。(3)4+32π(m).第八章綜合練習(xí),: .(1)主視圖:;左視圖:;(2)24;(3)26,.檢測站.(1)略;(2),底面積r=502402=30(cm2).全面積S=πr2+2πr179。12=2 400π(cm2).≥3,x≠.(2,2),(2+62,622).,.(1).y=5x,y=3x+2;(2)(53,3).=(x1)2+16,交點(diǎn)(4,9),(6,9).12.(1)6天,12天;(2)略;(3).(1)13。(3)13,.(1)12;(2)不公平,P(小亮勝)=58>12,可改為“小于32,則小亮勝”.15.(1)當(dāng)2x=(242x)179。(2)S=2x2+2x179。22179。(2)梯形;(3)45176。(2)略;(3)略;(4)當(dāng)x=a時(shí),周長最小,.(1)150人,1 050人;(2),A2,B1,B2,B3,C2,C3—矩形;A3—圓;C1—三角形;(2)1227.第二篇:青島版數(shù)學(xué)配套練習(xí)冊七下答案青島版數(shù)學(xué)練習(xí)冊七年級(jí)下冊參考答案 1.(1)∠A,∠C。(3)3個(gè),∠ABD,∠ABC,∠.(1)∠AEB,∠DAE,∠BEC,∠ADB;(2)∠C,∠。 1.(1)42176。.提示:設(shè)∠COE=x176。;(2)不變;提示:90+2x2x=45。20′24″;(2).(1)61176。12′。31′48″。9′36″。7′12″.6.(1)112176。55′;(3)125176。,6176。(2)176。.176。.6.(1)相等;(2)180176。. 1.∠3,∠176。30′,∠2=45176。30′,∠3=53176。.176。.176。,30176。.176。.4.(1)54176。26′。.176。.12.∠AOC+∠BOC=2(∠DOC+∠COE)=290176。A,O,∠BOE=x176。,∠AOB=1803x,∠DOB=(72x)2=1803x,解得x=∠EOC=72176。,∠EOF=170176。90176。.∠COF+∠DOE=100176。,∠COD=170176。=70176。.176。.176。,兩直線平行,同位角相等,65176。.176。.,BD,內(nèi)錯(cuò)角相等,.(1)EN,BD;(2)AB,.∠5=∠2=105176。.∥∥MN,DE∥:由AD∥BC,得∠A+∠B=180176。AB∥.(1)由∠3=∠B,知FD∥AB,知∠4=∠A;(2)由ED∥AC,知∠1=∠C,∠BED=∠,∠B=∠C,知AB∥CD,故∠A=∠.∠1=∠GMC=90176?!螰BC=30176。30176。.第九章綜合練習(xí)176。.提示:過點(diǎn)M畫MN⊥AB,MN∥EG,∠HMN=∠E,∠HMN=90176。.8.∠1=115176。.10.∠3=80176。.∥CD,所以∠AEF=∠2,∠AEG=∠3,因?yàn)椤螦EG=∠1+∠2,所以∠3=∠1+∠176。.∥CD,AD∥∥∠ =7,b=,共有y人外出參觀,35x+15=y, 45(x1)==6, y=225..+85,53y+=.(1)x=12,y=52。(3)m=2,n==1,y=:按丙的方法,35x=3,25y=4,得x=5,y=.(1)x=1,y=8。(2)x=1,y=2,z=,用a表示解,得x=a,y=a+1,z=a1,代入方程x+2y+3z=6,得a=,將x,=1911z,y=+y+2z=1911z+211z+2z=,①,②..(1)x=2,y=1,z=1。(2)3.(1)(ab)5。(2)anbn;(3)1.(1)x10。(2)(3)x12。(2)(a+b)7。(2).(1)14x5y4z2。(2)x4+4x2+2x4。(2)12x3+14x24x。(2)2a35a2b+8ab23b3。(2).(1)yx。(2).(1)3 129。(2)10 099。(2)x5。(2)103。(2)9y24x4。(4).(1)(300+3)(3003)=90 0009=89 991。(2)x42x2+1。(4)916s2+st+.(a+b)2=4ab+(ab)+2ab+b2=9,a22ab+b2==14(949)=+b2=92ab=+b2+c2++z2+.(1)2a2b2b4。(3)(1003)(1001)(100+1)(100+3)=(1049)(1041)=108105+9=99 900 (a+1). +.(1)xy(xy)。(3)2xy(1+2x4x2)。(5)2x(xy)2(12x). (2ax)=512510=510(251)=24 1.(x+2y)(x2y).=.(1)(6+x)(6x)。(3)(mn)2。(2)90 .(1)(1+a+b)(1ab)。=4(ab)2(a+b),(x+1)(x1).3.(a1)(x+y)(xy)..(1)m(m2+1)(m+1)(m1).(2)2x3(3y+1)(3y1).(3)(x+2)2(x2)2.(4)(x+1)=1223341110= 0122(2 01121)+(2 01321)=2 0122(2 011+1)(2 0111)+(2 013+1)(2 0131)=2 01224 024=1 ++2m2n++.(xy+2z)(xy2z)..(1)4x2+4xy+y225z2。(3).(1)2a3x2(2+a)(2a)。(3)(ab)2(a+b)2。(2)76 900。(2).(1)x2y4(xy2+z)(xy2z)。(3)12x(2a1)=(x+1)(2x3)=12時(shí),原式==(312+1)(36+1)(33+1)(331)=28(312+1)(36+1)(331).=12(ab)2=1.(1)√。(3)√。(5).2.△ABC,△BDC,△BEC?!螦,∠ACB,∠B?!鰽DC,△BDC。△ACD,△,組成4個(gè)三角形;當(dāng)四點(diǎn)中有三點(diǎn)共線時(shí),組成3個(gè)三角形;若該四點(diǎn)共線時(shí),:4,5,6,7,8,9,10,11,12(單位:厘米).,:1,4,4;2,3,4;2,4,4;2,4,5;3,4,3;3,4,4;3,4,5;3,4, ,.(1)AE,4厘米;(2)DAC,12;(3).△ABC,△ABD,△ADC,△ABE,△AEC,△.∠1=∠DAC=∠DAE=∠2.∠EAF=∠.(1)△BCD,△OCD;(2)△ABC,△ABO和△BOC有一條高重合;△BCD,△OCD和△176。.提示:∠APD=∠A2+∠.(1)125176。.176。.8.(1)105176。;(3)90176。.提示:延長BO交AC于D,∠BOC=∠BDC+12∠C=∠A+12∠B+12∠C=90176?!鰽BC,△ABD,△BCD,△ACD,△OAB,△OAC,△OBD,△ 440176。144176。.176。.1.√;;√;√;√;.,圓內(nèi),:AB,BC,CD,AD,BD,AC;半圓:ABC,ADC;優(yōu)?。築AD,CAD,BAC,ABD,ACB;劣?。篈B,BC,CD,AD,:2π(80+10)8=2π(80+10+x)10,x=(厘米).第2課時(shí) 1.;.(1π4).176。.176。∠C=140176。.176。72176。∠DAE=10176。.,3,.(1)3,,2n+ ,,診所(6,9),商店(7,3),學(xué)校(1,1)..(1)(C,4),(A,4),(0,3),(0,1),(A,0),(C,0),(D,1),(D,3)。(2)(,),(,0),(0,),(0,0),(,1).(1,1)為原點(diǎn)O′,x′軸∥x軸,y′軸∥y軸,分別以向右、向上為正向,單位長度不變,B,C坐標(biāo)分別是A(2,1),B(2,2),C(1,2). 176。(2)2。.2.∠DCE=∠ 176。..(1)22x23,21;(2)2y2+19y,=、三等門票33張,或購二等門票7張、:分三種情況分別列二元一次方程組,其中購一等門票、176。..(1)∠DOC=∠B=∠E;(2)不一定;.(a+1)2(a1)2.*,5,:D點(diǎn)在B,C之間和D點(diǎn)在B,建立直角坐標(biāo)系,以垂足為原點(diǎn),以直線BC為x軸,以高所在直線為y軸.第三篇:九年級(jí)英語(人教版)下冊 配套練習(xí)冊答案Unit 9 Section A一: 二:, scared 三: great lyrics with to not be kinds of music to, depending on of off, in time in a while/From time to time/Now and then, happy39。t, anymore 四: that/which I love kind of:ACAABCCC 二: 三:, sadness, interesting 四: up total/all is a pity only, but also music intruments, such as of China39。t mind less serious39。s national treasures his lifetime famous/known for worse 五: 七:CABCCAEDB , it music is mathematical, with notes in working about why music is an important subject that every child should 10 Section A一: 二: bring, left be do be 三: hands, for the first time plans to mistakes my surprise by mad/angry with/at39。t have to expected to be plans is, to be on time madSection B一:ABCBAADCBACDBAC 二: 三: having, getting say put, leaving make, feel 四: is no reason you can imagine is impolite family you to 五: 六: supposed the youngest person expected was, supposed to do having fun of, sore throat 七:CCDBAFFTFT Unit 11 Section A一: 二: ’ do三:BCBBB DABDB 四: me nervous her cry fun with out more。that badly。nor start with 五: makes ’t want not called in her position ’t like。nor ’t like to/didn’t want to Section B一:CBDBC。CDBAB 二: 三: steal followed 四: unhappy though heavy weight you down him off another word with together than。t the time, called, had finished Section B一:DBACD。t seen give 四: party canceled/canceled up test tricks most believable out away , embarrassing 五: my way me asked for 六: much, you can, had, seen many, had seen announced that aliens had landed on the earth, that, to 八:CABAC Unit 13 Section A一:。 三: full of。, into。 these problems。 of/about。 the top of。 to。 caught, killed。, that。 shown 五:BDECA Section B 一:。 二:A: 。B: 。C: 。 D: 。 三:BDADD。DBCBB 四: away。 down。 protection。 creative mind。s hard。t。 only, but also。 been seen。 六:FGBEC 七: 八: less,