问题
填空题
已知a=
|
答案
a=
=1 2+ 3
=2-2- 3 (2+
)(2-3
)3
,3
b=
=1 2- 3
=2+2+ 3 (2-
)(2+3
)3
,3
=a2-b2 2a-2b
=(a+b)(a-b) 2(a-b)
=a+b 2
=2.2-
+2+3 3 2
故答案为:2
已知a=
|
a=
=1 2+ 3
=2-2- 3 (2+
)(2-3
)3
,3
b=
=1 2- 3
=2+2+ 3 (2-
)(2+3
)3
,3
=a2-b2 2a-2b
=(a+b)(a-b) 2(a-b)
=a+b 2
=2.2-
+2+3 3 2
故答案为:2