在计算
时,甲错把
看成了4,得到结果是:
,乙错把
看成
,得到结果:
.
(1)求出
,
的值;
(2)在(1)的条件下,计算
的结果.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d90845b5b35d66defde7ab66442e2a94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82cb7ca9ecd0a1cfc0e7fd5fd8a12211.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5060ad37c403f248c937c1d59af5c71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4c0eaede87a85402c3a54e0746cf46d1.png)
(1)求出
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)在(1)的条件下,计算
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d90845b5b35d66defde7ab66442e2a94.png)
更新时间:2024-05-14 20:15:12
|
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解答题-问答题
|
适中
(0.65)
【推荐2】(1)先阅读,再填空:
(x+5)(x+6)=x2+11x+30;
(x-5)(x-6)=x2-11x+30;
(x-5)(x+6)=x2+x-30;
(x+5)(x-6)=x2-x-30.
观察上面的算式,根据规律,直接写出下列各式的结果:
(a+90)(a-100)=____________; (y-80)(y-90)=____________.
(2)先阅读,再填空:
;
;
;
.
观察上面各式:①由此归纳出一般性规律:
________;
②根据①直接写出1+3+32+…+367+368的结果 ____________.
(x+5)(x+6)=x2+11x+30;
(x-5)(x-6)=x2-11x+30;
(x-5)(x+6)=x2+x-30;
(x+5)(x-6)=x2-x-30.
观察上面的算式,根据规律,直接写出下列各式的结果:
(a+90)(a-100)=____________; (y-80)(y-90)=____________.
(2)先阅读,再填空:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77fc530917ade098f3a481f1ada4bd8c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c97f3e0b3eb6ad36aaba9e6c3c6bbe9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfdc088d5384f01280e91e9b5964a40c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00f40fc045386164b4e94f5a694ec8e4.png)
观察上面各式:①由此归纳出一般性规律:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/43a9558707fdb6e34c835639aee67d61.png)
②根据①直接写出1+3+32+…+367+368的结果 ____________.
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