һѡ⣨310=30䣩
1Уƽıξжƽıβеǣ
AڽǺΪ360 BǺΪ360 Cȷ DԽ 2ABCDУA=55㣬BCĶֱǣ
A135㣬55 B55㣬135 C125㣬55 D55㣬125 3ȷ۵ĸǣ
ƽıڽǺΪ360㣻ƽıζԽȣ ƽıζԽƽ֣ƽıڽǻ A1 B2 C3 D4
4ƽıһߵijΪ10cmôԽߵijȿǣ A4cm6cm B20cm30cm C6cm8cm D8cm12cm
2
5ABCDУAB+BC=11cmB=30㣬SABCD=15cmABBCֵǣ A5cm6cm B4cm7cm C3cm8cm D2cm9cm 6жУû涨ǣ
AбߺһֱDZ߶Ӧȵֱȫ; Bֱǻ; CȫζӦ;
Dƽϵĵ㵽ߵľ. 7˵ȷǣ
Aÿⶼ Bÿ涨 C DǼ 8һڽ֮Ϊ121Ӧ֮Ϊ A121 B121 C141 D1212
9һελ߰ηֳȵУ A2 B3 C4 D5
10ͼʾڡABCУMBCе㣬ANƽ֡BACBNANAB=?14?AC=19MNijΪ A2 B2.5 C3 D3.5
⣨310=30䣩
1114cmһ˿ΧһƽıΣ̱볤ߵ
Ϊ34̱ߵıΪ________ߵıΪ________
12֪ƽıεܳΪ20cmһԽֳ߰Σ?ܳ18cmԽ߳_________cm
13ABCDУABĴֱƽEFDABϵĴΪE?ABCD?ܳ
Ϊ38cmABDܳABCDܳ10cmABCDһڱֱ߳Ϊ______ 14ABCDУEBCһ㣬AB=BEAEӳ߽DCӳڵF
F=65㣬ABCDĸڽǶֱΪ_________
15ƽıڱߵijֱΪ20cm16cmߵľ8cm?̱ߵľ
_____cm 16һͽ۷ֱһ_____________?ô
Ϊ⣮
17⡰ֱƽУͬڽǻ_________
18ֱУ֪ߵijֱ43ߵij________
19ֱֱDZߵijֱΪ810бϵĸΪ________б߱߷ֳ
ֵijֱ__________ 20ABC߷ֱΪ512һcΪa+b+?c?3?ı?c?ӦΪ________
Ϊ________Σ
⣨610=60䣩
21ͼʾABCDУBFADFBECDEA=60㣬AF=3cmCE=2cmABCDܳ
23ͼʾ
ABCDܳ103+62ABij53DEABEDFCB
CB?ӳڵFDEij31CĴС2DFij
24ͼʾABCDУAQBNCNDQֱǡDABABCBCD?CDAƽߣAQBNPCNDQMڲ£дһƳĽۣ֤̣Ҫ?ҪõƽıΡ͡ƽߡ
25֪ABC߷ֱΪabca=n2-16b=8nc=n2+16n>4.
֤C=90㣮
26ͼʾڡABCУAC=8BC=6ڡABEУDEABDDE=12SABE=60?
CĶ
27֪λߵıΪ356εܳ112cm?λߵij
28ͼʾ֪AB=CDAN=NDBM=CM֤1=2
平行四边形经典练习题(3?附带详细解答过程 - 百度文库
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