简便计算:第一题:3.21×8.2+87×0.18+0.82×54.9 第二题:321.321÷321×3.21

来源:学生作业帮助网 编辑:作业帮 时间:2024/03/28 21:39:48
简便计算:第一题:3.21×8.2+87×0.18+0.82×54.9 第二题:321.321÷321×3.21

简便计算:第一题:3.21×8.2+87×0.18+0.82×54.9 第二题:321.321÷321×3.21
简便计算:第一题:3.21×8.2+87×0.18+0.82×54.9 第二题:321.321÷321×3.21

简便计算:第一题:3.21×8.2+87×0.18+0.82×54.9 第二题:321.321÷321×3.21
3.21×8.2+87×0.18+0.82×54.9
=3.21×8.2+8.7×(10-8.2)+8.2×5.49
=(5.49+3.21)×8.2+8.7×10-8.7×8.2
=8.7×8.2+8.7×10-8.7×8.2
=87
321.321÷321×3.21
=321.321÷(321÷3.21)
=321.321÷100
=3.21321