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.

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