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ǰλãҳ > 高中数学两平面垂直的判定和性质测试题及答案 - 百度文库

高中数学两平面垂直的判定和性质测试题及答案 - 百度文库

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  • 2025/7/12 7:16:42

AGAF AFD1 AGB1 ANFG B1D1FGl AMl ANl

MANΪĶǵƽǣΪ ABCDA1B1C1D1ⳤΪ1 AM AN MN cos arccos

ƽAFGƽAB1D1ɵĽarccos 3ⷨһB1D1A1C1O1 CC1ƽA1B1C1D1 CC1B1O1 ֡A1C1B1O1 B1O1ƽA1CC1

O1EA1CEB1EB1EA1C B1EO1ΪB1A1CC1ƽ

RTB1O1EУB1O1 B1E B1EA1CA1B1B1C sin 60

ֱⷨ빫ʽ B1EA1CEC1FA1CF

ֱB1EC1FɽǵڶB1A1CC1ƽ

B1EC1F CFEFA1E B1C11ע

13 ҳ

עRtA1C1CУCC1 FCA1C CF

RtA1B1CУA1B1 A1EA1C A1E EF

B1C1 B1E C1F EF 2B1EC1Fcos cos 60

ⷨӰʽ SCOS B1O1A1CC1

A1O1CΪA1B1CA1CC1ϵӰ 1 cos

14 ҳ

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AGAF AFD1 AGB1 ANFG B1D1FGl AMl ANl MANΪĶǵƽǣΪ ABCDA1B1C1D1ⳤΪ1 AM AN MN cos arccos ƽAFGƽAB1D1ɵĽarccos 3ⷨһB1D1A1C1O1 CC1ƽA1B1C1D1 CC1B1O1 ֡A1C1B1O1 B1O1ƽA1CC1 O1EA1CEB1EB1EA1C B1EO1ΪB1A1CC1ƽ RTB1O1EУB1O1 B1E B1EA1CA1B1B1C sin 60 ֱⷨ빫ʽ B1EA1CEC1FA1CF <

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