问题 解答题

30×(410-270)÷60

60÷[8×(54-45-3)]

[250-(120-90)]÷20.

答案

30×(410-270)÷60

=30×140÷60,

=70;

60÷[8×(54-45-3)]

=60÷[8×6],

=60÷6÷8,

=1.25;

[250-(120-90)]÷20

=[250-30]÷20,

=220÷20,

=11.

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