问题
解答题
用简便方法计算. 23×
7.2×
|
答案
(1)23×
+13 24
,13 24
=(23+1)×
,13 24
=24×
,13 24
=13;
(2)7.2×
+7.2÷4,3 4
=7.2×
+7.2×3 4
,1 4
=7.2×(
+3 4
),1 4
=7.2×1,
=7.2.
用简便方法计算. 23×
7.2×
|
(1)23×
+13 24
,13 24
=(23+1)×
,13 24
=24×
,13 24
=13;
(2)7.2×
+7.2÷4,3 4
=7.2×
+7.2×3 4
,1 4
=7.2×(
+3 4
),1 4
=7.2×1,
=7.2.