已知代数式
的值与字母x的取值无关,求
的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d0b0a2c65710754e261b08ec87033b86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d69b4292d2a55451aca808bdb3eaabf.png)
更新时间:2020-12-19 08:43:20
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解答题-计算题
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【推荐1】已知A=
,B=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c23067e3578fb41fe3b214ec2385a8f1.png)
(1)化简:2A-3B;
(2)当a=-1,b=2时,求2A-3B的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305f6d734b16927da7d40b42db82b261.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c23067e3578fb41fe3b214ec2385a8f1.png)
(1)化简:2A-3B;
(2)当a=-1,b=2时,求2A-3B的值.
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【推荐2】已知a是最小的正整数,b比﹣1大3,c的相反数还是它本身.
(1)求出a、b、c的值;
(2)计算(2a+3c)×b的值.
(1)求出a、b、c的值;
(2)计算(2a+3c)×b的值.
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【推荐1】如图所示,在数轴上原点
表示数
,
点在原点的左侧,所表示的数是
;
点在原点的右侧,所表示的数是
,并且关于
的多项式
是七次二项式.
(1)求
、
表示的数是多少?
(2)点
、
是数轴上的两个动点,点
从点
出发沿数轴向右运动,同时点
从点
出发沿数轴向右运动.且点
的速度是点
速度的
倍,经过
秒钟点
与点
相遇;求点
与点
的速度分别为每秒几个单位.
(3)在(2)的条件下,若
、
两点同时以(
)中各自的速度相向而行(
向右
向左),且点
运动到
点后原速返回,当点
到达点
时,
、
停止运动,经过几秒钟,
、
两点相距
个单位长度.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c95b6be4554f03bf496092f1acdfbb89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81dea63b8ce3e51adf66cf7b9982a248.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/579899b3b63f811595656df078cd2a20.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/28/20f30658-3b81-44ad-a9b9-778ee26e2e71.png?resizew=230)
(1)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2c94bb12cee76221e13f9ef955b0aab1.png)
(2)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
(3)在(2)的条件下,若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f8c4c029e552954bd493b49aeab82d5.png)
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【推荐2】⑴若
是一个二次多项式,求a的值;
⑵若上述多项式是一次二项式,求
、b的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89d6593522c13c51d10529743c953f97.png)
⑵若上述多项式是一次二项式,求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a6936d370d6a238a608ca56f87198de.png)
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【推荐2】先化简,后求值:(3a2﹣4ab)﹣2(a2+2ab),其中a,b满足|a+1|+(2﹣b)2=0.
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【推荐1】当多项式
不含二次项和一次项时,求m、n的值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60da48f7f5a1e8f09d39044ff8645fd0.png)
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【推荐2】我们定义一种新运算:x⊗y=xy+x﹣y.
(1)求2⊗(﹣4)的值;
(2)若代数式2⊗[x⊗k]的值与x无关,求实数k的值.
(1)求2⊗(﹣4)的值;
(2)若代数式2⊗[x⊗k]的值与x无关,求实数k的值.
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