9999*7778+3333*6666

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9999*7778+3333*6666
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9999*7778+3333*6666
9999*7778+3333*6666

9999*7778+3333*6666
9999*7778+3333*6666
=9999*7778+3333*(2222*3)
=9999*7778+9999*2222
=9999*(7778+2222)
=9999*10000
=99990000

9999×7778+3333×6666
=9999×7778+3333*(2222*3)
=9999×7778+9999*2222
=9999*(7778+2222)
=99990000.

左右两边先提出3333。原式=3333(3*7778+6666)
再提出3=3333*3(7778+2222)
=9999*10000
=99990000

解:9999×7778+3333×6666 =9999×7778+3333*(2222*3)
=9999×7778+9999*2222 =9999*(7778+2222)=9999*10000=99990000
其中"*"表示"乘".

9999×7778+3333×6666
=9999×7778+3333×(2222×3)
=9999×7778+9999×2222
=9999(×7778+2222)
=99990000.

(望接纳!)