问题
解答题
怎样简便怎样计算.
|
答案
(1)
×2 9
×27×33,5 11
=(
×27)×(2 9
×33),5 11
=6×15,
=90;
(2)
×(1÷2 7
-3 4
÷1),3 4
=
×(2 7
-4 3
),3 4
=
×2 7
,7 12
=
;1 6
(3)2006×
,2004 2005
=(2005+1)×
,2004 2005
=2005×
+1×2004 2005
,2004 2005
=2004+
,2004 2005
=2004
,2004 2005
(4)3
×2.6+13 4
×3.75,2 5
=3.75×2.6+1.4×3.75,
=3.75×(2.6+1.4),
=3.75×4,
=15;
(5)
×34+53×19 43
-19 43
,19 43
=
×(34+53-1),19 43
=
×86,19 43
=38;
(6)
×5 6
+11 10
×0.1+21 2
÷10,2 3
=
×5 6
+11 10
×1 2
+21 10
×2 3
,1 10
=(
+15 6
+21 2
)×2 3
,1 10
=5×
,1 10
=
.1 2