08四則運算03去括號的運算規則(選擇01)
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25 points
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25 points
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26 points
(1) 「92×15+15」和下面哪一個算式相等?
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(2) 300×12=(□+100)×12,□中的數是
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(4) 「17×42+A×42=31×42」,A 是
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(5) 下面哪一個式子的等號不成立?
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(6) 求 2015×2020-2010×2025 之值為何?
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(7) 「B×23=16×23-7×23」,B 是
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(8) 下面哪一個算式是錯的?
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(9) 84×(3+4)□84×3+84×4,□中應填入什麼符號?
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