100x1/2x99x1/2 简便计算

Question

如题所述

Answer 1

100x1/2x99x1/2
=100x1/2x(100－1)x1/2
=(100－1)×100x1/2x1/2

=(100－1)×100x1/4
=（100－1）×25
=100×25－1×25
=2500－25
=2475本回答被提问者采纳