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72*109怎样算简便?过程全面最好
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72*109怎样算简便?过程全面最好
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答案和解析
72*109
=72x(110-1)
=72x100+72x10-72x1
=7200+720-72
=7848
=72x(110-1)
=72x100+72x10-72x1
=7200+720-72
=7848
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