问题
解答题
下面各题怎样算简便就怎样算.
138×
|
答案
(1)
×3 14
+1 3
×2 3
×(3 14
-5 6
),3 8
=
×3 14
+1 3
×2 3
×3 14
,11 24
=
×(3 14
+1 3
×2 3
),11 24
=
×(3 14
+1 3
),11 36
=
×3 14
,23 36
=
;23 168
(2)138×
,7 137
=(137+1)×
,7 137
=137×
+1×7 137
,7 137
=7+
,7 137
=7
.7 137