2024-08-06 07:24:13 | 一起网
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解:(1)设
=
,
=
··················1分
∴t an30° = ························ 2分 = 解得: =3····························3分 =3 ∴ =6·····························4分 故答案为:6 (2)∵ =3, =6 ∴ = =3 ≈5.20米···················6分 |
| 略 |

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