下面两个题，怎样简便就怎样计算

下面两个题，怎样简便就怎样计算

① 6.3÷1.25÷0.8   文章源自趣课程-https://www.qukecheng.com/1084.html

② 9.6÷[(2.05-1.97)×0.4]文章源自趣课程-https://www.qukecheng.com/1084.html

解：①文章源自趣课程-https://www.qukecheng.com/1084.html

原式 =6.3÷1.25÷0.8文章源自趣课程-https://www.qukecheng.com/1084.html

        =6.3÷(1.25×0.8)文章源自趣课程-https://www.qukecheng.com/1084.html

        =6.3÷1文章源自趣课程-https://www.qukecheng.com/1084.html

        =6.3文章源自趣课程-https://www.qukecheng.com/1084.html

②文章源自趣课程-https://www.qukecheng.com/1084.html

原式=9.6÷[(2.05-1.97) ×0.4]文章源自趣课程-https://www.qukecheng.com/1084.html

        =9.6÷[0.08×0.4]文章源自趣课程-https://www.qukecheng.com/1084.html

        =9.6÷0.032

        =300