已知
+
+
=21,
+
+
=18,那么
+
=( ) ,
×
=( ) 。
![](https://img.xkw.com/dksih/QBM/2020/12/30/2625315518119936/2689568587497472/STEM/84d14d2f37234b248450223d7ca77be2.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2020/12/30/2625315518119936/2689568587497472/STEM/84d14d2f37234b248450223d7ca77be2.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2020/12/30/2625315518119936/2689568587497472/STEM/84d14d2f37234b248450223d7ca77be2.png?resizew=33)
![](https://img.xkw.com/dksih/QBM/2020/12/30/2625315518119936/2689568587497472/STEM/2fbf33828d184d2bbc8823361f8139ad.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2020/12/30/2625315518119936/2689568587497472/STEM/2fbf33828d184d2bbc8823361f8139ad.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2020/12/30/2625315518119936/2689568587497472/STEM/2fbf33828d184d2bbc8823361f8139ad.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2020/12/30/2625315518119936/2689568587497472/STEM/84d14d2f37234b248450223d7ca77be2.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2020/12/30/2625315518119936/2689568587497472/STEM/2fbf33828d184d2bbc8823361f8139ad.png?resizew=31)
![](https://img.xkw.com/dksih/QBM/2020/12/30/2625315518119936/2689568587497472/STEM/84d14d2f37234b248450223d7ca77be2.png?resizew=32)
![](https://img.xkw.com/dksih/QBM/2020/12/30/2625315518119936/2689568587497472/STEM/2fbf33828d184d2bbc8823361f8139ad.png?resizew=32)
更新时间:2021-03-31 08:44:12
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