Question

41.2×8.1+21×9又1/4+0.19×537

Answer 1

问：41.2×8.1+21×9又1/4+0.19×537

答：你好，你所求的41.2×8.1+21×9又1/4+0.19×537答案是537.5

答：你好，你所求的41.2×8.1+21×9又1/4+0.19×537答案是630

答：41.2×8.1+21×9.25+537×0.19＝41.2×10×0.81+0.21×925+537×0.19＝41.2×10×（1-0.19）＋0.21×（800+125）+537×0.19＝412-412×0.19+0.21×800+0.21×125+537×0.19=412+0.19×（537-412）+0.21×800+0.21×125=412+0.19×125+0.21×800+0.21×125=412+0.4×125+0.21×800=412+50+168=630

答：这是第一题的第二种简便算法

答：第二问的答案是11/15

答：解答步骤如上图所示

答：最后一题答案24/5