问题
解答题
化简求值:
|
答案
∵a=
,b=1
+23
,1 2- 3
∴a=2-
,b=2+3
,3
原式=
+1 a
×a-b a-2b 2b-a (a+b)(a-b)
=
-1 a 1 a+b
=a+b-a a(a+b)
=b a(a+b)
=2+ 3 (2-
)(2-3
+2+3
)3
=
.7+4 3 4
化简求值:
|
∵a=
,b=1
+23
,1 2- 3
∴a=2-
,b=2+3
,3
原式=
+1 a
×a-b a-2b 2b-a (a+b)(a-b)
=
-1 a 1 a+b
=a+b-a a(a+b)
=b a(a+b)
=2+ 3 (2-
)(2-3
+2+3
)3
=
.7+4 3 4