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2019-2020辽宁省虹桥中学七年级上册阶段性测试

2019-2020辽宁省虹桥中学七年级上册阶段性测试
2019-2020辽宁省虹桥中学七年级上册阶段性测试

人教版七年级数学下册 单元测试卷

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(3) s或15s或30s或45s 【解析】【解答】(2)解:当OI在直线OA的上方时, 有∠MON=∠MOI+∠NOI= (∠AOI+∠BOI))= ∠AOB= ×120°=60°, ∠PON= ×60°=30°, ∵∠MOI=3∠POI, ∴3t=3(30-3t)或3t=3(3t-30), 解得t= 或15; 当OI在直线AO的下方时,

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