题主您好！首先把它们都换算成cm,那么就是71cm。cm换算成m就是缩小100倍，小数点向左移两位，那么就是0.71m。希望可以帮助到您，望采纳！
7dm1cm等于0.71m
7dm1cm=0.71m
1dm=0.1m,1cm=0.01m,那么7dm=0.7m,所以7dm1cm=0.7m+0.01m=0.71m
