问题 解答题

用递等式计算.

20.4÷3.4-0.36

90÷(12.4+5.6)

4.16÷[(9.25-8.6)×0.8].

答案

(1)20.4÷3.4-0.36

=6-0.36,

=5.64;

(2)90÷(12.4+5.6)

=90÷18,

=5;

(3)4.16÷[(9.25-8.6)×0.8]

=4.16÷[0.65×0.8],

=4.16÷0.52,

=8.

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