先找规律、再计算 (1)140+150+160+170+180=_×_=_ (2)230+240+250+260=_×_=_.
问题描述:
先找规律、再计算
(1)140+150+160+170+180=______×______=______
(2)230+240+250+260=______×______=______.
答
(1)(1)140+150+160+170+180
=160×5
=800;
(2)230+240+250+260
=(240+250)÷2×4
=245×4
=980.
故答案为:160,5,800,245,4,980.