北京市通州?019-2020学年中考数学二模试卷含解析 - 百度文库

9D

Aͼʾ3a2ʴѡ Bͼʾ3a2ʴѡ

Cͼʾ1b22b1֩3a2abʴѡ DѡCɵãѡȷ ѡD

㣺ʵ 10B

ԳͼεĸԸѡжϼɵý⣮ ⡿

⣺AԳͼΣʱѡ BԳͼΣʱѡȷ CԳͼΣʱѡ DԳͼΣʱѡ ѡB 㾦

⿼ԳͼεĸԳͼεĹؼѰҶԳᣬͼ۵غϣ 11B

ҵĶ塢Ķ塢ԼȷԲɽ ⡿

⣺ԲȷȷԲ뾶Ǽ⣬ʴ˵ ֱңֱԲң⣬ʴ˵ȷ ֱֻйԲĵҲֱǼ⣬ʴ˵

ܰԲǻһǰԲԲһֱ˵ԲֳÿһаԲ԰ԲǻȰԲĻŻȰԲСĻӻеĻǰԲ⣬ʴ˵ȷ

д˵Ǣ٢ ѡB

⿼ֱ𣬻Բ𣬼ȷԲҪֱԲ 12B

ת̱ȷֳ6 ɫռеһ ָָɫĸ=ѡA

㣺θʣ

⣺⹲6С⣬ÿС4֣24֣ 132xx-12

2x34x2+2x=2x(x2?2x?1)?2x(x?1)2 141

⣬|x|-1=0x-10x=-1 㣺ʽֵΪ 15

1 62550 613

OMNĶһֵͼ֪ڡOMNУҡOMNΪֱ. ʵONM=90MON=90ʱOMNֱ. ˣҪֱ. (1) ONM=90ʱDNBC.

EEFBCΪF.(ͼ) RtABCУA=90㣬AB=AC C=45㣬 BC=20

RtABCУAC?BC?cosC?BC?cos45??20?DEǡABCλߣ

2?102 2

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