678乘678减677乘679(巧算)
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678乘678减677乘679(巧算)
![678乘678减677乘679(巧算)](/uploads/image/z/19245293-53-3.jpg?t=678%E4%B9%98678%E5%87%8F677%E4%B9%98679%EF%BC%88%E5%B7%A7%E7%AE%97%EF%BC%89)
678x678-677x679
=678x678-677x(678+1)
=678x678-677x678-677
=678x(678-677)-677
=678-677
=1
=678x678-677x(678+1)
=678x678-677x678-677
=678x(678-677)-677
=678-677
=1
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