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\u5bf9\u4e8e\u7b2c\u4e00\u4e2a\u95ee\u9898\uff0c\u53ef\u4ee5\u7528\u4e58\u6cd5\u5f53\u4f8b\u5b50\uff1a
\n\\begin{align}
\n5\\times 27 = 5 \\times \\left(20+7\\right) \\\ = 5 \\times 20 + 5 \\times 7 \\\ = 5 \\times 7+ 5 \\times 2\\times 10 \\\ = 35 + 10\\times 10
\n\\end{align}
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