问题
解答题
已知a=
|
答案
当a=
-1时,3
a3+3a2+1=(
-1)3+3×(3
-1)2+13
=(
-1)(4-23
)+12-63
+13
=4
-6-4+23
+12-63
+13
=3.
已知a=
|
当a=
-1时,3
a3+3a2+1=(
-1)3+3×(3
-1)2+13
=(
-1)(4-23
)+12-63
+13
=4
-6-4+23
+12-63
+13
=3.