问题
解答题
(1)已知a-
(2)已知x=
|
答案
(1)∵(a+
)2=(a-1 a
)2+4=61 a
∴a+
=±1 a
;6
(2)x2+2xy+y2=(x+y)2
=(
+1+2
-1)2=8.2
(1)已知a-
(2)已知x=
|
(1)∵(a+
)2=(a-1 a
)2+4=61 a
∴a+
=±1 a
;6
(2)x2+2xy+y2=(x+y)2
=(
+1+2
-1)2=8.2