问题
解答题
先想好运算顺序,再计算.
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答案
(1)4620+(401-438÷73)
=4620+(401-6)
=4620+395
=5015;
(2)520×(80-720÷9)
=520×(80-80)
=520×0
=0;
(3)408×(3080-1980)+712
=408×1100+712
=448800+712
=449512;
(4)642-(172+28)÷4
=642-200÷4
=642-50
=592.