2-1生活中的平面圖形--測驗1
課本習作運用
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1.
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2. 已知∠1=123°,∠2與∠1互補,∠3與∠2互餘,∠4是∠3的對頂角,則∠4=?
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3. 已知∠A和∠B互補,若∠B=(90+b)°,則∠A應如何表示?
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4.
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5.
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6. 平面上三條直線交於一點,請問共有幾組對頂角?
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7. 高速鐵路線上共設有5站,請問高速鐵路公司共需準備多少種車票?(去、回算2種)
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8.
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