45.6×6.7+4.56×31+0.456×20用简便方法=几啊

问题描述:

45.6×6.7+4.56×31+0.456×20用简便方法=几啊

45.6×6.7+4.56×31+0.456×20
=4.56×67+4.56×31+4.56×2
=4.56×(67+31+2)
=4.56×100
=456