问题 解答题
先想好运算顺序,再计算.
4620+(401-438÷73)520×(80-720÷9)
408×(3080-1980)+712642-(172+28)÷4.
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.

单项选择题
单项选择题