问题
解答题
已知a=
|
答案
由a=
=1
-12
+1>0,b=2
=1
+12
-1>0,2
则
(ab
-a b
)b a
=
•ab
-a b
•ab b a
=|a|-|b|
=a-b
=(
+1)-(2
-1)2
=2
已知a=
|
由a=
=1
-12
+1>0,b=2
=1
+12
-1>0,2
则
(ab
-a b
)b a
=
•ab
-a b
•ab b a
=|a|-|b|
=a-b
=(
+1)-(2
-1)2
=2