2000减197 用简便算法怎么做
问题描述:
2000减197 用简便算法怎么做
答
2000-197
=2000-197-3+3
=2000-(197+3)+3
=2000-200+3
=1800+3
=1803
答
=1800+200-197
=1803
答
=2000-(200-3)
=2000-200+3
=1800+3
=1803