=99999*(22222+33333)
=99999*55555
=(100000-1)*55555
=5555500000-55555
=5555444445
= (100000-1)*(22222+33333)
=(100000-1)*55555
=5555500000-55555
=5555444445
22222*99999+99999*33333
=(22222+33333)*99999
=55555*99999
=55555*100000-55555
=5555500000-55555
=5555444445
22222×99999+99999×33333
=99999(22222+33333)
=55555(100000-1)
=5555500000-55555
=5555444445
原式=(22222+33333)*99999
=55555*99999
=55555*(100000-1)
=5555500000-55555
=5555444445