问题
解答题
已知a=
|
答案
a=2+
,b=2-3 3
-a b
=a•b a
-b•1 a 1 b
=(2+
)(2+3
)-(2-3
)(2-3
)3
=[(2+
)+(2-3
)][(2+3
)-(2-3
)]3
=4×23
=8
.3
已知a=
|
a=2+
,b=2-3 3
-a b
=a•b a
-b•1 a 1 b
=(2+
)(2+3
)-(2-3
)(2-3
)3
=[(2+
)+(2-3
)][(2+3
)-(2-3
)]3
=4×23
=8
.3