99乘以102减1484,怎样简便运算?
问题描述:
99乘以102减1484,怎样简便运算?
答
99*102-1484
=(100-1)(100+2)-1484
=100*100+100-2-1484
=101*100-1486
=101*100-15*100+14
=86*100+14
=8614