∠α的余角与∠α的补角之和为120°,∠α的度数是( )
A.60° | B.65° | C.70° | D.75° |
更新时间:2020-01-26 15:14:16
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【知识点】 与余角、补角有关的计算解读
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【推荐1】如图,A、O、B在一条直线上,
是锐角,则
的余角是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/149b4c5b-a305-4369-ab14-00d563abac25.png?resizew=144)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5b69d40b75d582c4b8ffa2369af1d41.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/2/16/149b4c5b-a305-4369-ab14-00d563abac25.png?resizew=144)
A.![]() | B.![]() | C.![]() | D.![]() |
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【推荐2】下列说法正确的是( )
(1)如果互余的两个角的度数之比为
,那么这两个角分别为
和![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cde7aace5b888a1a1c26fb911e2f49.png)
(2)如果两个角是同一个角的补角,那么这两个角不一定相等
(3)如果两个角的度数分别是
和
,那么这两个角互余
(4)一个锐角的余角比这个锐角的补角小![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
(1)如果互余的两个角的度数之比为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc5881f1ce9b4172ca346032d0fd1e3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1cde7aace5b888a1a1c26fb911e2f49.png)
(2)如果两个角是同一个角的补角,那么这两个角不一定相等
(3)如果两个角的度数分别是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/711fb2bc6db926dc846bcadcd69b34b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d0a992cb0f3329b68467741392feb2.png)
(4)一个锐角的余角比这个锐角的补角小
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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