问题
解答题
(1)求值:2
(2)已知x+
|
答案
(1)原式=2
=2×6 33×(
)2×123 2
=2×3=6.6 36
(2)∵x+
=3,1 x
∴(x+
)2=32,化为x2+1 x
=9-2=7.1 x2
(1)求值:2
(2)已知x+
|
(1)原式=2
=2×6 33×(
)2×123 2
=2×3=6.6 36
(2)∵x+
=3,1 x
∴(x+
)2=32,化为x2+1 x
=9-2=7.1 x2