计算:99999×77778+33333×66666方法一:99999×77778+33333×66666
=33333×3×77778+33333×3×22222
=33333×(233334+66666)
=33333×300000
=9999900000方法二:99999×77778+33333×66666
=99999×77778+99999×22222
=99999×(77778+22222)
=99999×100000
=9999900000
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