问题
解答题
巧用方法求总和.
|
答案
(1)450+460+470
=460×3,
=1380;
(2)480+490+500,
=490×3,
=1470;
(510+520+530,
=520×3,
=1560.
巧用方法求总和.
|
(1)450+460+470
=460×3,
=1380;
(2)480+490+500,
=490×3,
=1470;
(510+520+530,
=520×3,
=1560.