问题
解答题
|
答案
(1)384-198,
=384-(200-2),
=384-200+2,
=186;
(2)208+699,
=208+(700-1),
=208+700-1,
=907;
(3)125×32,
=125×8×4,
=1000×4,
=4000;
(4)630÷35÷2,
=630÷(35×2),
=630÷70,
=9.
|
(1)384-198,
=384-(200-2),
=384-200+2,
=186;
(2)208+699,
=208+(700-1),
=208+700-1,
=907;
(3)125×32,
=125×8×4,
=1000×4,
=4000;
(4)630÷35÷2,
=630÷(35×2),
=630÷70,
=9.