(1)计算
÷2
.
(2)先化简,再求值.(a+b)2+(a-b)(2a+b)-3a2,其中a=2+
,b=
-2.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/febfa3dde414fef83b166af1fc370363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3f8c3ba00c59e0634ed10fa85289de.png)
(2)先化简,再求值.(a+b)2+(a-b)(2a+b)-3a2,其中a=2+
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3f8c3ba00c59e0634ed10fa85289de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c3f8c3ba00c59e0634ed10fa85289de.png)
18-19八年级上·全国·期中 查看更多[1]
更新时间:2018-08-18 21:18:32
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