问题
解答题
混合运算.
25×4-240÷4
128-28×3+17
600-(697÷41+274)
[300-(56+44)]÷25.
答案
(1)25×4-240÷4
=100-60
=40;
(2)128-28×3+17
=128-84+17
=44+17
=61;
(3)600-(697÷41+274)
=600-(17+274)
=600-291
=309;
(4)[300-(56+44)]÷25
=[300-100]÷25
=200÷25
=8.