用简便方法计算 (1)678+(354+322) (2)283+147+17+1653 (3)384-(37+184) (4)2904-1327-173 (5)653-197 (6)125×17-125 (7)235×99 (8)(1300

问题描述:

用简便方法计算
(1)678+(354+322)
(2)283+147+17+1653
(3)384-(37+184)
(4)2904-1327-173
(5)653-197
(6)125×17-125
(7)235×99
(8)(1300-520)÷13
(9)67×21+18×21+85×79
(10)222222×999999.

(1)678+354+322                              &nbs...