选择合适的方法计算.
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-![](https://img.xkw.com/dksih/QBM/2018/12/21/2101684256243712/2102286434041856/STEM/fbadda80ccb04ea28bb13da0002f7650.png?resizew=7)
+
-
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![](https://img.xkw.com/dksih/QBM/2018/12/21/2101684256243712/2102286434041856/STEM/fc8f6b29c0044119bca352b2eb9603c1.png?resizew=7)
![](https://img.xkw.com/dksih/QBM/2018/12/21/2101684256243712/2102286434041856/STEM/9115c64daed44643b786ee966985b790.png?resizew=39)
![](https://img.xkw.com/dksih/QBM/2018/12/21/2101684256243712/2102286434041856/STEM/ffb34524af8b4bd9b37fd3d2973bc609.png?resizew=14)
![](https://img.xkw.com/dksih/QBM/2018/12/21/2101684256243712/2102286434041856/STEM/4a5ad9d00b7d452f91ac4a5dd5beea6e.png?resizew=7)
![](https://img.xkw.com/dksih/QBM/2018/12/21/2101684256243712/2102286434041856/STEM/fbadda80ccb04ea28bb13da0002f7650.png?resizew=7)
![](https://img.xkw.com/dksih/QBM/2018/12/21/2101684256243712/2102286434041856/STEM/fbadda80ccb04ea28bb13da0002f7650.png?resizew=7)
![](https://img.xkw.com/dksih/QBM/2018/12/21/2101684256243712/2102286434041856/STEM/d67439c598484528832d7f8034e0f1e0.png?resizew=14)
![](https://img.xkw.com/dksih/QBM/2018/12/21/2101684256243712/2102286434041856/STEM/89fd827d5e144b6db1d79468d1ae1053.png?resizew=14)
![](https://img.xkw.com/dksih/QBM/2018/12/21/2101684256243712/2102286434041856/STEM/b656e373c8de4e13ac0bccabf6048041.png?resizew=7)
![](https://img.xkw.com/dksih/QBM/2018/12/21/2101684256243712/2102286434041856/STEM/acfd072af58f44f1bdf9471a56a3985f.png?resizew=39)
更新时间:2018-12-22 14:55:36
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相似题推荐
计算题-口算和估算
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适中
(0.65)
【推荐2】口算。
45×2= 650-90= 205×8= 386+14=
+
=
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= 55—5×2= 25×4=
45×2= 650-90= 205×8= 386+14=
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6503ca085e3ca5f2ba723b0dd66e210b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69ee3c61d2298e75fc4f1643f8ebc2e4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eac97e6740365c85ad857aff85cefbe5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d33adb74906403b0b00fcbd9fa691d8b.png)
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