1 . 若用斜二测画法画出某△ABC水平放置的直观图,得到边长为2的等边三角形,则原
的面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
A.![]() | B.![]() | C.4 | D.![]() |
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2 .
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51742eeb6e7e94b9061503dc67e00c7c.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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3 . 已知向量
,且
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9139dbaedc10534d1f799dbce02818e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8dc173e86408b076d087d605fe0b8690.png)
A.![]() | B.![]() |
C.向量![]() ![]() ![]() | D.向量![]() ![]() ![]() |
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4 . 已知向量
满足
,若
与
的夹角为
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b172cf8d898883d82e973f28c3c3a3e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b9656216369e6cb6f74b9237ad6347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/338189ec20d1ec7fdbbc189d209428dd.png)
A.1 | B.![]() | C.![]() | D.![]() |
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5 . 化简
值为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/428370b1b4cd1916722f8b6ca86c042e.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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6 . 平行四边形ABCD中,
,求:
(1)
的值;
(2)
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c03ffc540ce28b441934b77675690f14.png)
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a47b376264d525c790ebad49a849c08.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a5cb63aeea0b37799404c8fec092b21d.png)
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7 . 已知
、
是平面内所有向量的一组基底,则下列四组向量中不能作为基底的一组是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0411792b587ddd3e04440392f011c224.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b95d660852c5226ff65a21cfb36b8b39.png)
A.![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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8 . 在
中,角
的对边分别为
,已知
.
(1)求
;
(2)若
,
,求
的面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76f0649064a085fb74c997fb507a9b6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27bd4e04b002855018bc76a99084cfc6.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/413f9851aad373d782ae62b308f1de85.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1225fd03e8e8730dac8487dae5387635.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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9 . 已知
满足
.
(1)求
;
(2)若
为
的角平分线,
,
,求
的周长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3e2ec1e75ebf4650e20d8570b971fd7.png)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d70dc2c20619a4fc12a0cfda59af5b69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
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10 . 已知
,则
( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/283cd7c02c81dc12314b2ca106903242.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6ffa8a470279c412befce0bac3d3e93.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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