=18063+5778
=23841;
(2)900+100×260-60
=900+26000-60
=26900-60
=26840;
(3)279+(345-145×2)
=279+(345-290)
=279+55
=334;
(4)1000-(75×3+763)
=1000-(225+763)
=1000-988
=12.
匿名回答于2024-05-23 07:42:58