12.35x37-123.5x1.9+1.235x820求简便方法
问题描述:
12.35x37-123.5x1.9+1.235x820求简便方法
答
原式=12.35X37-12.35X10X1.9+1.235X10X82 =12.35X37-12.35X19+12.35X82 =12.35X(37-19+82) =12.35X100 =1235