2.5*12.5*6.4*1.7怎么巧算?
问题描述:
2.5*12.5*6.4*1.7怎么巧算?
答
2.5*12.5*6.4*1.7
=2.5*12.5*0.8*8*1.7
=2*100*1.7
=340