问题
填空题
200.5×199.5=______.
答案
200.5×199.5,
=(200+0.5)×(200-0.5)
=2002-0.52,
=40000-0.25,
=39999.75.
故答案为:39999.75.
200.5×199.5=______.
200.5×199.5,
=(200+0.5)×(200-0.5)
=2002-0.52,
=40000-0.25,
=39999.75.
故答案为:39999.75.