计算:
•3tan60°+
+
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0a36aaf903722dad882c68e8256ee390.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03de31a872a395136f7b54fd5a0f221b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cde029ac94c601540583c64bc48c17bb.png)
2021九年级·陕西·专题练习 查看更多[1]
(已下线)类型一 实数的混合运算-2021年《三步冲刺中考·数学》(陕西专用)之第2步大题夺高分
更新时间:2021-03-29 08:54:09
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解答题-计算题
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适中
(0.65)
【推荐2】(1)(5mn2﹣4m2n)(﹣2mn);(2)(a+b)2﹣a(a+2b);
(3)(2a﹣1)(2a+1)﹣a(4a﹣3);(4)﹣14+(2020﹣π)0﹣(﹣
)﹣2;
(5)利用乘法公式简便计算:20202-2019×2021;
(6)先化简,再求值:[(5m﹣3n)(m+4n)﹣5m(m+4n)]÷(-3n),其中m=2,n=﹣1.
(3)(2a﹣1)(2a+1)﹣a(4a﹣3);(4)﹣14+(2020﹣π)0﹣(﹣
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
(5)利用乘法公式简便计算:20202-2019×2021;
(6)先化简,再求值:[(5m﹣3n)(m+4n)﹣5m(m+4n)]÷(-3n),其中m=2,n=﹣1.
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解答题-问答题
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适中
(0.65)
【推荐1】如图,已知四边形
为矩形,且B点坐标为
,反比例函数
的图象与矩形交于D点和E点,且
,连接
.
(2)求
的长.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63e3fa43e765646223675ef9bbd6d2f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c16711ffd0a06bb5821d67fe1f6286a3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05621b18b7ffc991d9f30380e2e08fea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d15510729f874261e12f231e307d7353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
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解答题-计算题
|
适中
(0.65)
【推荐2】例题:化简![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98d9d0e5ea58e1d36fd1d0adddad4a30.png)
解:∵
,且
,
∴![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82098b743c3f9324bf071c31615f1d43.png)
(1)化简![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f52a49827b10ed69c411a4fc24b7ea.png)
(2)化简![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb3095711cd322936f0cb8c9d990a0e6.png)
(3)化简![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b7f0099783f84df2774dce053b8ca7.png)
(4)若
,则m,n与a,b的关系是什么?并说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98d9d0e5ea58e1d36fd1d0adddad4a30.png)
解:∵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0e162837452aa9e6357f4a454317368.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c42dd3d728a3445b271e56e30a1b6590.png)
∴
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82098b743c3f9324bf071c31615f1d43.png)
(1)化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93f52a49827b10ed69c411a4fc24b7ea.png)
(2)化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb3095711cd322936f0cb8c9d990a0e6.png)
(3)化简
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a4b7f0099783f84df2774dce053b8ca7.png)
(4)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e81405d743622595836ca766bda4fdb.png)
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解答题-计算题
|
适中
(0.65)
【推荐2】(1)计算:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/653a95f858470f8fb8120fa751b27361.png)
(2)解不等式组:
,并把解集在数轴上表示出来.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/653a95f858470f8fb8120fa751b27361.png)
(2)解不等式组:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/547db1cb7fc4d9e1368c460392c7045a.png)
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