问题
解答题
29×
|
答案
29×
+27×29 28
,27 28
=(28+1)×
+(28-1)×29 28
,27 28
=28×
+1×29 28
+28×29 28
-1×27 28
,27 28
=29+
+27-29 28
,27 28
=(29+27)+(
-29 28
),27 28
=56+
,1 14
=56
.1 14
29×
|
29×
+27×29 28
,27 28
=(28+1)×
+(28-1)×29 28
,27 28
=28×
+1×29 28
+28×29 28
-1×27 28
,27 28
=29+
+27-29 28
,27 28
=(29+27)+(
-29 28
),27 28
=56+
,1 14
=56
.1 14