TÝnh D = 10 + 12 + 14 + … + 994 + 996 + 998 16/10/2021 Bởi Anna TÝnh D = 10 + 12 + 14 + … + 994 + 996 + 998
D = 10 + 12 + 14 + … + 994 + 996 + 998 = (10+998)×[(998-10):2+1]:2 = 1008×495:2 = 498 960:2 = 249480 Bình luận
D = 10 + 12 + 14 + … + 994 + 996 + 998
= (10+998)×[(998-10):2+1]:2
= 1008×495:2
= 498 960:2
= 249480