问题
解答题
算一算.
(2.1+5.6)÷O.7
8.4÷2.4+15.3
7.8÷0.8×2.5
38.5÷0.5+22.75.
答案
(1)(2.1+5.6)÷O.7,
=7.7÷O.7,
=11;
(2)8.4÷2.4+15.3,
=3.5+15.3,
=18.8;
(3)7.8÷0.8×2.5,
=9.75×2.5,
=24.375;
(4)38.5÷0.5+22.75,
=77+22.75,
=99.75.