1994.5*79+0.24*790+244.9
问题描述：
1994.5*79+0.24*790+244.9
：
答
原式=1994.2*79+2.4*79+3.1*79
=（1994.2+2.4+3.1）*79
=2000*79
=2000*80-2000
=160000-2000
=158000