问题
解答题
用递等式计算,能巧算的要巧算.
|
答案
(1)125×53×80,
=125×80×53,
=1000×53,
=53000;
(2)1325-1225÷25,
=1325-49,
=1276;
(3)150+(140×8-252),
=150+(1120-252),
=150+868,
=1018;
(4)178×78-78×78,
=78×(178-78),
=78×100,
=7800;
(5)771-169+229-431,
=(771+229)-(169+431),
=1000-600,
=400.