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

(10000-1)*7778+3333*(3*2222)
=10000*7778-7778*1+3333*3*2222
=77772222+9999*2222
=77772222+(10000-1)*2222
=77772222+10000*2222-1*2222
=77772222+22220000-2222
=99990000

9999*7778+3333*6666
1111*7778*9+18*1111*1111
77772222+12217778
99990000