45.6×6.7+4.56×31+0.456×20用简便方法＝几啊_数学解答

45.6×6.7+4.56×31+0.456×20用简便方法＝几啊

人气：129 ℃　时间：2019-12-22 17:06:23

解答

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