45.6*6.7+4.56*31+0.46*20的简便运算

问题描述:

45.6*6.7+4.56*31+0.46*20的简便运算

45.6*6.7+4.56*31+0.456*20
=45.6*6.7+45.6*3.1+45.6*0.2
=45.6*(6.7+3.1+0.2)
=45.6*10
=456