问题
解答题
能简算的要写出简算过程). 27.25-(3.86+7.25)
|
答案
(1)27.25-(3.86+7.25),
=27.25-3.86-7.25,
=27.25-7.25-3.86,
=20-3.86,
=16.14;
(2)
×2002,2000 2001
=
×(2001+1),2000 2001
=
×2001+1×2000 2001
,2000 2001
=2000+
,2000 2001
=2000
.2000 2001