计算:
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97b6deace9a4f39a7f033b1fc9ea3187.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3c51bf2c79170be034cb692efecbf9f.png)
更新时间:2023-12-07 11:16:16
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【推荐2】计算
(1)
; (2)用乘法公式计算:20202-2019×2021
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d116f01baed1117cbd000576ff90e66.png)
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