利用乘法公式计算:
(1)
;
(2)
;
(3)
;
(4)
.
(1)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3918864a70f5f506e5ccd3d6f07c35ef.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbbbf14f3ae9eac8c4ccf7329d835912.png)
(3)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/220ad80b45023dc311603e152b179e8f.png)
(4)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5d8765680b5645c26b4dc6beb0a2e2c0.png)
更新时间:2020-09-01 06:13:29
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【推荐1】先化简,再求值:3(a+1)2﹣(2a+1)(2a﹣1),其中a=
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【推荐2】解答题:
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【推荐1】(1)已知
,
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(2)先化简,再求值:
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【推荐2】先化简,再求值:(2x-3)2+(x+4)(x-4)+5x(2-x),其中x=-
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