问题 解答题

递等式计算:

2.54+2.84+7.46

2.5×4-4.8÷1.6

3.2÷0.4×(5.38-4.13)

[11.4-(2.8÷0.7-2.5×1.2)]÷5.2.

答案

(1)2.54+2.84+7.46,

=(2.54+7.46)+2.84,

=10+2.84,

=12.84;

(2)2.5×4-4.8÷1.6,

=10-3,

=7;

(3)3.2÷0.4×(5.38-4.13),

=3.2÷0.4×1.25,

=8×1.25,

=10;

(4)[11.4-(2.8÷0.7-2.5×1.2)]÷5.2,

=[11.4-(4-2.5×1.2)]÷5.2,

=[11.4-(4-3)]÷5.2,

=[11.4-1]÷5.2,

=10.4÷5.2,

=2.

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