早教吧 育儿知识 作业答案 考试题库 百科 知识分享

简便方法计算:6.49×0.22+258×0.0649+5.3×6.49+64.9×0.19.

题目详情
简便方法计算:6.49×0.22+258×0.0649+5.3×6.49+64.9×0.19.
▼优质解答
答案和解析
6.49×0.22+258×0.0649+5.3×6.49+64.9×0.19
=6.49×0.22+2.58×6.49+5.3×6.49+6.49×1.9
=6.49×(0.22+2.58+5.3+1.9)
=6.49×10
=64.9