最新新课程课堂同步练习册九年级数学下册人教版答案名师优秀教案.docx
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最新新课程课堂同步练习册九年级数学下册人教版答案名师优秀教案.docx
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最新新课程课堂同步练习册九年级数学下册人教版答案名师优秀教案
新课程课堂同步练习册(九年级数学下册人教版)答案
数学课堂同步练习册(人教版九年级下册)参考答案
第二十六章二次函数
26.1二次函数及其图象
(一)
2一、DCC二、1.?
0,=0,?
0,=0,?
0=0,2.y,x,6x
3.,二y,x(10,x)
122三、1.y,x2.
(1)1,0,1
(2)3,7,-12(3)-2,2,03.y,3x16?
26.1二次函数及其图象
(二)
2一、DBA二、1.下,(0,0),轴,高2.略3.答案不唯一,如yy,,2x三、1.的符号是正号,对称轴是轴,顶点为(0,0)2.略ya
23.
(1)
(2)否(3)3,6,;,,3,6y,,2x,,,,
?
26.1二次函数及其图象(三)
一、BDD二、1.下,32.略三、1.共同点:
都是开口向下,对称轴为y轴(
12a,不同点:
顶点分别为(0,0);(0,,);(0,,,).2.3.y,,3x,54?
26.1二次函数及其图象(四)
x,,3一、,,,二、1.左,,,2.略3.向下,,(,,,,)
112a,三、1.2.3.yx,,3ac,,,3,2,,34
?
26.1二次函数及其图象(五)
x,1一、CD,二、1.,(1,1)2.左,1,下,23.略
22yx,,,12三、1.略2(
(1)
(2)略3.
(1),,a,6h,2k,,3y,6(x,2),3
(2)直线x,,,2223小
2yx,,,122(
(1)
(2)略,,
?
26.1二次函数及其图象(六)
3731(,)直线x,,;,5一、BBDD二、1.2.5;3.<2224
212b4acb,222y(x4)6y3(x)ya(x),,,,,,,,,,三、1.略332a4a
22.解:
(1)设这个抛物线的解析式为(由已知,抛物线过A(20),,,B(10),,yaxbxc,,,
steelbolts,screwsandstudsGB/T3098.6-2000scopeofthisprojectare:
1,2,3aluminiumsheetcurtainwallofglasscurtainwallandtheAluminumplasticBoardcurtainwall4,andstonecurtainwall5,andcurtainwallburiedpieces6,andlightsteelpointstypeglassraincanopy,andaluminumBoardraincanopy7,andaluminumVenetian8,andoutdooradvertising(containingroofingandtheStatesurfaceadvertising)9tospringglassdoor10,andconcretestructureandcurtainwallbetweenoflayerbetween,andaroundfiresealblocking11,andanti-mine12,anddaughterwalltopprocessing13,andpanlightming,engineeringoftieconstruction14,andbuildingsofdeformationsewing(settlementsewing,andexpansionjoints,)15,andAfterthedetaileddesigndrawingsissuedawallembeddedpartisinconsistentwiththetendererneedstoincreasefixedcurtainwallstructure16,decorativesurfacesanddecorativesurfaceandjointsbetweenpartsofotherbuildingsfacingsealingprocess,requiredtosupporttheouterdecorationofahole,hole,pluggingholesandsoon.Thisworksmoredecorativeitems,inordertoensurethatthedecorationconstructionprogressandquality,tryingtoavoidconstructiondoesnot...Processing.Afterinstallationiscompleteifyouhavedamagedgalvanizedpartsshould
420abc,,,,a,2,,
,abc,,,0,b,2三点,得解这个方程组,得(C(28),,,
,428abc,,,(c,,4,,
2所求抛物线的解析式为(yxx,,,224?
219,,22
(2)(yxxxxx,,,,,,,,,2242
(2)2,,22,,
19,,该抛物线的顶点坐标为(?
,,,,22,,
?
26.2用函数观点看一元二次方程
33,1,x,一、CDD二、1.(-1,0);(2,0)(0,-2)2.一3.;;或,122
3xx,,,1或x,,1x,3三、1.
(1)或
(2),-1或,3xx2
12,126,0,26,0,(3),,32.
(1)yx,,,,23
(2)和x,,,,,,2
?
26.3实际问题与二次函数
(一)
2,2一、ACD二、1.大182.73.400cm
2三、1.
(1)当矩形的长与宽分别为40m和10m时,矩形场地的面积是400m
2
(2)不能围成面积是800m的矩形场地.
2(3)当矩形的长为25m、宽为25m时,矩形场地的面积最大,是625m
2.根据题意可得:
等腰直角三角形的直角边长为,矩形的一边长为.2xm2xm
20422,,x,,,,,1022x其相邻边长为,,2
1,,Sxxxx,,,,,,,2102222?
该金属框围成的面积,,,,2
20,,,,32220xx1052,(,x,),,
10当时,金属框围成的面积最大.x,,,30202
322,
260402xm,,此时矩形的一边长为,,,
10221032210210,,,,,,m相邻边长为.,,,,,,
agedgalvanizedpartsshouldonprogressandquality,tryingtoavoidconstructiondoesnot...Processing.Afterinstallationiscompleteifyouhavedamtructitionofahole,hole,pluggingholesandsoon.Thisworksmoredecorativeitems,inordertoensurethatthedecorationconsddecorativesurfaceandjointsbetweenpartsofotherbuildingsfacingsealingprocess,requiredtosupporttheouterdecoracesanedawallembeddedpartisinconsistentwiththetendererneedstoincreasefixedcurtainwallstructure16,decorativesurfandbuildingsofdeformationsewing(settlementsewing,andexpansionjoints,)15,andAfterthedetaileddesigndrawingsissumine12,anddaughterwalltopprocessing13,andpanlightming,engineeringoftieconstruction14,a-sealblocking11,andantiaceadvertising)9tospringglassdoor10,andconcretestructureandcurtainwallbetweenoflayerbetween,andaroundfireesurfncanopy,andaluminumBoardraincanopy7,andaluminumVenetian8,andoutdooradvertising(containingroofingandtheStatasticBoardcurtainwall4,andstonecurtainwall5,andcurtainwallburiedpieces6,andlightsteelpointstypeglassrai2000scopeofthisprojectare:
1,2,3aluminiumsheetcurtainwallofglasscurtainwallandtheAluminumpl-steelbolts,screwsandstudsGB/T3098.62
2Sm,,,,1003223002002.,,,,最大
26.3实际问题与二次函数
(二)
25212.5一、ABA二、1.,2.3.或50
(1),x2
x,7.5三、1.40元当元时,元W,625最大
22.解:
(1)降低x元后,所销售的件数是(500+100x),y=,100x+600x+5500(0,x?
11)22
(2)y=,100x+600x+5500(0,x?
11)配方得y=,100(x,3)+6400当x=3
时,y的最大值是6400元。
即降价为3元时,利润最大。
所以销售单价为10.5
元时,最大利润为6400元。
答:
销售单价为10.5元时,最大利润为6400元.
m,,x,1003.
(1)(0?
x?
100)
(2)每件商品的利润为x,50,所以每天的利润为:
y,(x,50)(,x,100)
2?
函数解析式为yxx,,,,1505000
150(3)?
在50,x,75元时,每天的销售利润随着x的增大而增大x,,,752,(,1)
26.3实际问题与二次函数(三)
2一、ACB二、1.10(2.3.3yRR,,30,,
三、1.
(1)矩形广场四角的小正方形的边长为35米或者10米(
(2)当矩形广场四角的小正方形的边长为22(5米时,所铺设设铺设矩形广场地面的总费最小,最少费用为199500元(
12y,,(x,6),5215,6)2.(1
(2)(12
32AD,30,x(cm)3.
(1)
(2)当(x,20cm时,y取最大值为300cm4
第二十七章相似
?
27.1图形的相似
(一)
一、1.B2.A3.C二、1.是不是2.(3)(5)3.B三、1.
(1)与(3),
(2)与(9),(4)与(7),(5)与(6),(10)(11)(12)(13),(14)(16)分别是相似图形2.(略)
?
27.1图形的相似
(二)
一、1.C2.B3.B二、1.1:
50002.70?
50?
3.2三、1.
(1)b=2,c=3
(2)32.?
C′=112?
AB=20BC=16
ABAE69?
DF3,?
3.?
?
?
?
ABEDEF,(即,(2DFDEDF
22ABCD,,D90?
Rt?
DEFEF,,,2313在矩形中,(在中,(?
?
27.2.1相似三角形
(一)
.Processing.Afterinstallationiscompleteifyouhavedamagedgalvanizedpartsshouldiveitems,inordertoensurethatthedecorationconstructionprogressandquality,tryingtoavoidconstructiondoesnot..ecoratfacingsealingprocess,requiredtosupporttheouterdecorationofahole,hole,pluggingholesandsoon.Thisworksmoredeasefixedcurtainwallstructure16,decorativesurfacesanddecorativesurfaceandjointsbetweenpartsofotherbuildingsoincrionjoints,)15,andAfterthedetaileddesigndrawingsissuedawallembeddedpartisinconsistentwiththetendererneedst3,andpanlightming,engineeringoftieconstruction14,andbuildingsofdeformationsewing(settlementsewing,andexpansmine12,anddaughterwalltopprocessing1-eandcurtainwallbetweenoflayerbetween,andaroundfiresealblocking11,andantidoutdooradvertising(containingroofingandtheStatesurfaceadvertising)9tospringglassdoor10,andconcretestructur8,anwallburiedpieces6,andlightsteelpointstypeglassraincanopy,andaluminumBoardraincanopy7,andaluminumVenetiansheetcurtainwallofglasscurtainwallandtheAluminumplasticBoardcurtainwall4,andstonecurtainwall5,andcurtain2000scopeofthisprojectare:
1,2,3aluminium-steelbolts,screwsandstudsGB/T3098.63
ANAC一、1.C2.B3.C二、1.,2.83.2
AEAD42BCBFDE,,3三、1.?
?
,?
?
,,,,,DEEFABECBD63BFAE23,3BC,3,4.5,7.5,,?
,?
?
FC,,4.5FCEC32
CEF2.?
四边形ABCD是正方形,?
AD?
BC,?
?
.,DAF
CFEFCE21?
,,,DFAFAD42
?
27.2.1相似三角形
(二)
20一、1.B2.C3.C二、1.是3?
52.23.3三、1.?
四边形ABCD是平行四边形?
?
ABC?
?
CDA?
E.F分别是AB.BC的中点?
EF?
AC?
?
EBF?
?
ABC?
?
EBF?
?
CDA
如图所示:
2.
3.?
AB=3cm?
OA=2cm4.提示:
连结BC,证CD?
AB?
27.2.1相似三角形(三)
ADAC8323,一、1.A2.B3.C二、1.或2.3.32ACAB4
111ABCDEDFEFDEBCEFABDFAC,,,,,三、1.?
、、是?
的中位线?
222
DEEFDF1,,,?
?
?
ABC?
?
FEDBCABAC2
CFACACFGCAACFGCA,2.
(1)?
?
?
(提示:
证)
(2)?
?
?
?
ACCG
,,,CAF1,,,,,,,,,,12245CAFACB?
?
0,,,,CD903.?
ADQQCP?
?
?
四边形ABCD是正方形?
,
1ADDCBC,,BPPC,3CDPCBC,Q?
,是的中点?
,4
onprogressandquality,tryingtoavoidconstructiondoesnot...Processing.Afterinstallationiscompleteifyouhavedamtructitionofahole,hole,pluggingholesandsoon.Thisworksmoredecorativeitems,inordertoensurethatthedecorationconsddecorativesurfaceandjointsbetweenpartsofotherbuildingsfacingsealingprocess,requiredtosupporttheouterdecoracesanedawallembeddedpartisinconsistentwiththetendererneedstoincreasefixedcurtainwallstructure16,decorativesurfandbuildingsofdeformationsewing(settlementsewing,andexpansionjoints,)15,andAfterthedetaileddesigndrawingsissumine12,anddaughterwalltopprocessing13,andpanlightming,engineeringoftieconstruction14,a-sealblocking11,andantiaceadvertising)9tospringglassdoor10,andconcretestructureandcurtainwallbetweenoflayerbetween,andaroundfireesurfncanopy,andaluminumBoardraincanopy7,andaluminumVenetian8,andoutdooradvertising(containingroofingandtheStatasticBoardcurtainwall4,andstonecurtainwall5,andcurtainwallburiedpieces6,andlightsteelpointstypeglassrai2000scopeofthisprojectare:
1,2,3aluminiumsheetcurtainwallofglasscurtainwallandtheAluminumpl-steelbolts,screwsandstudsGB/T3098.6agedgalvanizedpartsshould4
11PCCQ1,?
,?
?
?
?
DQCQDCBC,,,ADQQCP,,22DQAD2
?
27.2.1相似三角形(四)
AEAD,,,2C一、1.A2.B3.C二、1.或或,,,B1,ACAB
2.1.53.4.BAC1?
423
o三、1.?
ABE与?
ADC相似(理由如下:
?
AE是?
O的直径,?
?
ABE=90,
o?
AD是?
ABC的边BC上的高,?
?
ADC=90,?
?
ABE=?
ADC(
又?
同弧所对的圆周角相等,?
?
E=?
C(?
?
ABE?
?
ADC(
2.
(1)?
ED?
AEEBADDF,,,,?
BF,?
,,,CEBABF,
又.,,,CA,?
?
?
?
CBEAFB
CBBE5CB5?
?
?
CBEAFB,?
(2)由
(1)知,又(?
,.AFAD,2,AD4AFFB8
?
27.2.2相似三角形应用举例
一、1.C2.C二、1.减小3.52.53.15.1m
ABBCABACBC,,,,,ABCDEF三、1.?
ABC?
?
DEF(提示:
证,,或)DEDFEFDEEF2.延长EA、DB相交与点G,设GB为米,ED为y米?
AB?
FC?
EDx
x1.6x1.6x,1,y?
,得,=11.2答:
(略),x,13.2xy,6
3.?
A′B′?
OS,AB?
OS?
?
A′B′C′?
?
SOC′?
?
ABC?
?
SOC
’’’’ABB’CBBC’CABBC'',,ABAB,,?
,?
?
.OSOCOSOC’OCOC’
1.81ABBC1.51OBx,x,5,,,设米,?
?
?
?
OSOCh51,xx,,,41.81
?
h,9()米答:
(略)
?
27.2.3相似三角形的周长与面积
2一、1.A2.C3.B二、1.82.700cm3.1?
2三、1.BC=20A′B′=18A′C′=302.S?
S=1?
9?
AEF?
ABC
.Processing.Afterinstallationiscompleteifyouhavedamagedgalvanizedpartsshouldiveitems,inordertoensurethatthedecorationconstructionprogressandquality,tryingtoavoidconstructiondoesnot..ecoratfacingsealingprocess,requiredtosupporttheouterdecorationofahole,hole,pluggingholesandsoon.Thisworksmoredeasefixedcurtainwallstructure16,decorativesurfacesanddecoratives
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