两道简算题

问题描述:

两道简算题
① 99*99+199
② 6666*8+1111*52

99*99+199
=99*99+99+100
=(99+1)*99+100
=9900+100
=10000
6666*8+1111*52
=6*1111*8+1111*52
=1111*(48+52)
=111100