问题
解答题
用简便方法计算. (1)36×(
(2)2.05-
|
答案
(1)36×(
-3 4
+1 2
),1 6
=36×
-36×3 4
+36×1 2
,1 6
=27-18+6,
=9+6,
=15;
(2)2.05-
-11 9
,7 9
=2.05-(
+11 9
),7 9
=2.05-2,
=0.05.
用简便方法计算. (1)36×(
(2)2.05-
|
(1)36×(
-3 4
+1 2
),1 6
=36×
-36×3 4
+36×1 2
,1 6
=27-18+6,
=9+6,
=15;
(2)2.05-
-11 9
,7 9
=2.05-(
+11 9
),7 9
=2.05-2,
=0.05.