用简便方法计算51*49+3.51*49+5.1*35.1
问题描述:
用简便方法计算51*49+3.51*49+5.1*35.1
答
51*49+3.51*49+5.1*35.1 =51×49+3.51×(49+51)
=(50+1)(50-1)+351
=2500+351-1=2500+350=2850