简便运算666.66*6666.7+99999*22.222

666.66×6666.7+99999×22.222
=666.66×6666.7-22.222+100000*22.222
=30*22.222*6666.7-22.222+100000*22.222
=30*6666.7*22.222-22.222+100000*22.222
=(200001-1)*22.222+100000*22.222
=300000*22.222
=6666600