46.7-38.2+33.3-1.8怎样简便计算?
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46.7-38.2+33.3-1.8怎样简便计算?46.7-38.2+33.3-1.8怎样简便计算?46.7-38.2+33.3-1.8怎样简便计算?46.7-38.2+33.3-1.8=46.7+3
46.7-38.2+33.3-1.8怎样简便计算?
46.7-38.2+33.3-1.8怎样简便计算?
46.7-38.2+33.3-1.8怎样简便计算?
46.7-38.2+33.3-1.8
=46.7+33.3-38.2-1.8
=(46.7+33.3)-(38.2+1.8)
=80-40
=40
正数与正数一合,负数与负数一合,然后再做合。
46.7+33.3=80……①
-38.2-1.8=-40……②
①+②=40