① 0.67×99+6.7×0.1 ② 44444×33334+33333×88888

问题描述:

① 0.67×99+6.7×0.1 ② 44444×33334+33333×88888
请问以上两题如何简便?

①=0.67×99+0.67×1
=0.67×(99+1)
=0.67×100=67
②原式=44444×33334+66666×44444
=44444×(33334+66666)
=44444×100000
=4444400000