问题
解答题
下面各题怎样简便就怎样算. 3.7×99+3.7
5.37-1.47-2.53 105×(
13+45÷9
|
答案
(1)3.7×99+3.7,
=3.7×(99+1),
=3.7×100,
=370;
(2)
+3 4
-1 6
,3 8
=
+18 24
-4 24
,9 24
=
;13 24
(3)5.37-1.47-2.53,
=5.37-(1.47+2.53),
=5.37-4,
=1.37;
(4)105×(
+1 3
),1 5
=105×
+105×1 3
,1 5
=35+21,
=56;
(5)13+45÷9,
=13+5,
=18;
(6)
×2 3
+5 8
×1 3
,5 8
=(
+2 3
)×1 3
,5 8
=1×
,5 8
=
.5 8