问题
解答题
已知a+b=-8,ab=12.求
|
答案
∵(
+b a
)2a b
=
+b a
+2a b
=b2+a2+2ab ab
=(a+b)2 ab
=
;64 12
∴原式=
=64 12 4 3
.3
已知a+b=-8,ab=12.求
|
∵(
+b a
)2a b
=
+b a
+2a b
=b2+a2+2ab ab
=(a+b)2 ab
=
;64 12
∴原式=
=64 12 4 3
.3