79乘以12.5巧算
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79乘以12.5巧算
![79乘以12.5巧算](/uploads/image/z/17984324-20-4.jpg?t=79%E4%B9%98%E4%BB%A512.5%E5%B7%A7%E7%AE%97)
79×12.5
=(80-1)×12.5
=80×12.5-12.5
=1000-12.5
=987.5
=(80-1)×12.5
=80×12.5-12.5
=1000-12.5
=987.5
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