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江苏省南通市2001-2019年中考数学试题分类解析专?:平面几何基础 - 百度文库

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֮ʹڵߵĹA348A߶βΡѡA

15.ʡͨ20113֣ͼABCDDCE80㣬BEF

A120 B110 C100 D80 𰸡C

㡿ƽߵʡ

ƽͬڽǻʣABCDDCE͡BEFͬڽǣӶBEF1800?800?1000ѡC

16.2012ͨ3֣֪?32o?IJΪ A58o B68o C148o D168o 𰸡C

㡿ǵĶ塣

ݻΪǵĺ͵180ʽ㼴ɵý⣺

ߡ?=32㣬?IJΪ180㣭32=148㡣ѡC

1. 2001ͨ2֣ͼֱL1ֱL2ཻ1402ĶΪ

𰸡140 㡿ƽǶ塣

ƽǵĶֱӼ㼴ɣ2=180118040140

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5. ʡͨ20022֣ һεڽǺ1440㣬ô Σ 𰸡ʮ

㡿ڽǺͶ

öεڽǺΪn-2?180㼴ɽ⣺

εıΪn⣬ãn2?180=1440㣬n=10

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6. ʡͨ20032֣μԳͼĶԳͼΣԳͼĶԳͼεͼβһΣ磬ԲԳͼĶԳͼΣԲΣѧļͼپӣֻҪдͼƣ 𰸡Σ߶Σ𰸲Ψһ 㡿ĶԳͼΣԳͼΡ

ԳͼκĶԳͼεĸֻҪдͼηͼεμɣ߶ΣżߵΡ

7. ʡͨдپ20053֣֪ϦϦ»࣬ҡϦ=3518䣬

Ϧ= . 𰸡5442 㡿ǡ

Ƕֱӽ𣺡Ϧ=90㣭Ϧ=90㣭3518=5442䡣

10. ʡͨ200 83֣֪A40㣬Aǵ ȣ 𰸡50 㡿ǡ

Ƕֱӽ𣺡Aǵ90㣭40=50㡣

11. ʡͨ20083֣ͼDEBCABACDE㣬CFΪBCӳ

ߣADE

50㣬ACF110㣬A ȣ

𰸡60

㡿ڽǺͶƽߵʡ

ƽߵʺεڽǺͶ⣺

DEBCAED=ACB=180㣭ACF=70㡣 A=180㣭70㣭50=60㡣

12. ʡͨ20113֣֪??20㣬??ǵ

𰸡70 㡿ǡ

ǵĶ壺ǵĺΪ90㣬ǻֱ࣬ӵó902070

1. ʡͨ20046֣ͼι԰ĸ㣬ֲͬķҪƳĸֱ֣߷ָÿڸһ㣻ǸֵȡǦʻֻҪͼȷд

𰸡⣺𰸲Ψһ

㡿ͼӦͼεʡ

ĶԳͼΣԽߵĽ㣬һഹֱֱһͼηֳɵȡ

2. ʡͨдپ20055֣

֪: AOB,MN.

P,ʹPڡAOBƽ,PM=PN. Ҫó߹ͼ,ͼۼ,д

𰸡⣺AOBƽߣ߶MNĴֱƽߣĵQ

㡿ͼͼ

1AOBƽߣ2MNĴֱƽߣ߽㼴Ϊ 3. ʡͨдپ20066֣֪ABCͼABCԲҪó߹ͼͼۼдҪ֤

𰸡⣺£

1߶ABĴֱƽl1 2߶BCĴֱƽl2

3l1l2ĽOΪԲģOAΪԲԲԲOΪԲ

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