ʱ : 【多套试卷】人教版七年级下册数学第六章实数培优试题 - 百度文库ϿʼĶ
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16.P?m?3,m?2?ϣôm= PΪ . 17.ͼã0,0)ʾAλãã2,1ʾBλãֱΪ .
BA
18ͼ֪A1(10)A2(11)A3(11)A4(11)A5(21)A2 017Ϊ .
һ:7С⣬66. ֻҪ˼, ϸ, һȷ!
1910֣ͼABCֱϵУ 1дABCꣻ 2ABC
3ѡABCƽ2λƽ2λõA'B'C'ͼлABC仯λãдA'B'C'.
2010֣֪P(2m4m1). ԷֱP. 1PȺ3
2PڹA(23)㣬xƽеֱ.
2110֣ͼʾķͼУdzÿСεĶΪ㡱ԸΪνΡͼΣش.
1ͼиABCɸABCͨƽƵõģ
2ֱabΪὨƽֱϵAΪ(34)дDEF꣬DEF.
2212֣֪ͼıABCDĸֱΪA00B90C75D27
1ԼıABCD
2ıθĺ궼2궼3ô仯Ϊʲô
2312֣ͼƽֱϵxOyУA-10B-3-3BCOABC=4OA.
1Cꣻ 2ABC.
2412֣֪A01B20C43 1ABC
2PϣҡABPABCȣP꣮
2512֣ͼʾƽֱϵУABֱΪA(a0)B(b0)ab |a2|b40CΪ(03).
1abֵSABC
1
2MxϣSACM3SABCM.
ο
1.D 2.C 3.C 4.C 5.A 6.D 7.A 8.A 9.C 10.C 11.21 12.-32 13.5 14. 91 15.ֱƽУ 16.250
17.31.523.554.583.571.5 18.(505504)
19.1۲ͼο֪ABCΪA(11)B(42)C(13).
2ͼƽֱϵصɵã
SABC=45-
111(24)-(31)-(53)= 7 2223λñ仯ġA'B'C'ͼʾ۲֪A'(11)B'(64)C'(35).