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巴中市中考题及答案

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············································· 1分 ?A(?2,0),B(2,0) ·又

点B在y??3x?b上 43?0???b

23b?

233······································································· 2分 ?BC的解析式为y??x? ·

4232?y??x?3?x1??1???4(2)由?,得?9

33y1??y??x???4??429???C??1,?,B(2,0)

4???x2?2 ·················································· 4分 ?y?0?29 ······················································································· 5分 4199················································································· 6分 ?S△ABC??4?? ·

242(3)过点N作NP?MB于点P EO?MB ?NP∥EO

······················································································ 7分 ?△BNP∽△BEO ·

BNNP ································································································· 8分 ??BEEO?AB?4,CD?由直线y??33?3?x?可得:E?0,? 42?2??在△BEO中,BO?2,EO?35,则BE? 2262tNP,?NP?t ················································································ 9分 ?5352216?S?t(4?t)

25312S??t2?t(0?t?4) ············································································· 10分

55312S??(t?2)2? ····················································································· 11分

5512此抛物线开口向下,?当t?2时,S最大?

5??当点M运动2秒时,△MNB的面积达到最大,最大为

12. ···························· 12分 5

巴中市中考题及答案

·············································1分?A(?2,0),B(2,0)·又点B在y??3x?b上43?0???b23b?233·······································································2分?BC的解
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