用简便方法计算 49.5*13.5+50.5*13-0.5*49.5
问题描述:
用简便方法计算 49.5*13.5+50.5*13-0.5*49.5
答
解
49.5*13.5+50.5*13-0.5*49.5
=49.5×(13.5-0.5)+50.5×13
=49.5×13+50.5×13
=13×(49.5+50.5)
=13×100
=1300