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.
30×(410-270)÷60
60÷[8×(54-45-3)]
[250-(120-90)]÷20.
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.