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.