简便算法:9999×7778+3333 ×

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简便算法:9999×7778+3333×简便算法:9999×7778+3333×简便算法:9999×7778+3333×9999*7778+3333*3*2222=9999*7778+9999*222

简便算法:9999×7778+3333 ×
简便算法:9999×7778+3333 ×

简便算法:9999×7778+3333 ×
9999*7778+3333*3*2222=9999*7778+9999*2222=9999*(2222+7778)=99990000

9999×7778+3333×6666
=9999×(10000-2222)+3333×6666
=99990000-9×1111×2×1111+3×1111×6×1111
=99990000-18×1111×1111+18×1111×1111
=99990000

9999×7778+3333 × 6666
=3333×3×7778+3333×6666
=3333×23334+3333×6666
=3333×(23334+6666)
=3333×30000
=99990000

设x=1111
9999×7778+3333 × 6666=9x*(7x+1)+3x*6x
=81x*x+9x=9x*(9x+1)
=99990000

原式=9999*7778+3333*3*2222
=9999*7778+9999*2222
=9999*(2222+7778)
=99990000