45.6*6.7+4.56*31+0.456*20=?
问题描述：
45.6*6.7+4.56*31+0.456*20=?
答
原式=45.6*6.7+45.6*3.1+45.6*0.2
=45.6*(6.7+3.1+0.2)
=456