99999乘以7778+33333乘以66666怎么简便

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99999乘以7778+33333乘以66666怎么简便99999乘以7778+33333乘以66666怎么简便99999乘以7778+33333乘以66666怎么简便99999×77778+3333

99999乘以7778+33333乘以66666怎么简便
99999乘以7778+33333乘以66666怎么简便

99999乘以7778+33333乘以66666怎么简便
99999×77778+33333×66666
=99999×7778+33333×3×22222
=99999×77778+99999×22222
=99999×(77778+22222)
=99999×100000
=9999900000

99999×7778+33333×66666
=99999×7778+99999×22222
=99999×(7778+22222)
=99999×30000
=2999970000

应该是77778吧?
99999乘以77778+33333乘以66666
=99999*77778+99999*22222
=99999(77778+22222)
=99999*100000
=9999900000

原式=99999×7778+99999×22222
=99999×(7778+22222)
=99999×30000
=(100000-1)×30000
=2 999 970 000
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