1 . 已知
中,
,
,
,
,求
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60b97bb18e5ca34d22b5e827316a122a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8dec514927ab13511f5534553a894b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8991bd597e40909ff29d05e6592e6194.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b42ce1684a0a63cf3a4a3f3dff58e0a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
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2 . 已知
的三边分别为
,
和
,试求
最大内角的度数.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08ce80e91fdf435a8e3ec05be990e9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/65f9c88edac18a30697feb5a9956b70b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2033f18cafb5d3df000b7f66bd415658.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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3 . 如图,在
中,
,
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a6f36741b86f464be362b12bac13d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f34365e5040ce6944115c8da61bf110.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ae7888d643678ea18f83f3237732052.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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4 . 在
中,已知
,
,
,求c和
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/39900a2d790732077ffb571427a134fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d40b808e547806a2405a59da6aa2aae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/809597d571792b1dfb070a462146b69e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
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5 . 如图,货轮在海上以40km/h的速度沿着南偏东40°的方向航行,货轮在B点观测灯塔A在其南偏东70°的方向上,航行半小时到达C点,此时观测灯塔A在其北偏东65°的方向上.求C点与灯塔A的距离.
您最近一年使用:0次
解题方法
6 . 已知汽车从踩刹车到停车所滑行的距离
与速度
之间有如下关系式:
,其中
是比例系数,且
,
是汽车质量(t).若某辆卡车不装货物(司机体重忽略不计)以36km/h的速度行驶时,从刹车到停车需要走20m.当这辆卡车装着等于车重的货物行驶时,为保证安全,要在发现前面20m处有障碍物时能在离障碍物5m以外处停车,则最高速度应低于多少(设司机发现障碍物到踩刹车需经过1s)?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0dd602a7c31f2c2f5786031980776db.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/054c828437049f0fd0da07010b560b27.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d4e0d3ade104af13ac9cbee0ba8919.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0a532e15e232cb4b99a8d4d07c89575.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f0d68648b10fce54dfc19c5ee60086d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
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解题方法
7 . 某产品的总成本
(万元)与产量
(台)之间满足如下关系式:
(
,
).若每台产品的售价为25万元,则生产者不亏本(销售收入不小于总成本)时的最低产量为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d053b14c8588eee2acbbe44fc37a6886.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de937856de44c42f881f459fa0822668.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b031f72519133f81c99493ddd4378ba6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c37a2030e17877d4588b74fe14ed656.png)
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8 . 解不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320441b1bc4a5f53265ef400edaadba.png)
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9 . 解不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9d53d7eed2abd35f16c47413bfbdd81.png)
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10 . 解不等式
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cb93f6c25cb374f59b51550c7f5c9f89.png)
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