问题
填空题
已知
|
答案
∵
=14-6 5
=3-32-2×3×
+(5
)25
，5
∴
=3- 5 9-3
+25 14-6 5
=3- 5 9-3
+6-25 5
=3- 5 15-5 5
，5 5
∵知
=2.236，5
∴原式=
=0.4472．2.236 5
故答案为：0.4472．
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已知
|
∵
=14-6 5
=3-32-2×3×
+(5
)25
，5
∴
=3- 5 9-3
+25 14-6 5
=3- 5 9-3
+6-25 5
=3- 5 15-5 5
，5 5
∵知
=2.236，5
∴原式=
=0.4472．2.236 5
故答案为：0.4472．