2/1又1994乘79+20/11乘790+244.9简便怎么算
问题描述:
2/1又1994乘79+20/11乘790+244.9简便怎么算
答
2/1又1994乘79+20/11乘790+244.9
=2/1又199.4乘790+20/11乘790+244.9
=790(2/1又199.4+20/11)+244.9