赞 共回答了100个问题采纳率：92.9%
解题思路：根据二次根式的性质直接化简开平方求出即可．
18=
9×2=3
2．
故答案为：3
2．
点评：
本题考点： 二次根式的性质与化简．
考点点评： 此题主要考查了二次根式的性质与化简，正确开平方得出是解题关键．
14
可能相似的问题
-
已知函数f(x)=cos^4 x－2sin x cos x－sin^4 x
2024-05-031个回答
-
已知函数f(x)=sin( - x)coswx+cos已知函数f(x)=sin(pai-wx)coswx+cos平方wx
2024-05-031个回答
-
已知函数f(x)=2cos x sin(x+pai/6)-sin^2x+cos^2x.
2024-05-032个回答
-
已知函数Y=2sin^X+2sinXcosX-5cos^X 已知函数Y=2sin^X+2sinXcosX-5cos^X,
2024-05-031个回答
-
已知函数f(x)=x2+(sinα-2cosα)x+1是偶函数 则sinαcosα=
2024-05-034个回答
-
sin cos三角函数题解已知α为锐角 sinα=3cosα 求sinαcosα
2024-05-032个回答
-
刚学完三角函数,1.已知COS∝/(1+SIN∝)=A,SIN∝/(1+COS∝)=B,A-B=k(COS∝-SIN∝)
2024-05-031个回答
-
would you please tell me _ a.what to do b.how to do it c.whe
2024-05-034个回答
-
英语!英语!Please tell me_____next.A how to do B what to do it C
2024-05-037个回答
-
what will you do if you are asleep?please tell me the way to
2024-05-036个回答
-
Please tell me____to improve my English. 为什么填what to do
2024-05-035个回答
-
Would you please tell me what to do next? do 为及物动词后跟宾语,为什么wh
2024-05-032个回答
-
would you please tell me()next A how to do B what to do C wh
2024-05-031个回答
-
Could you tell me ___ to do next,please?填what还是how?
2024-05-033个回答
-
Would you please tell me __ next?A.how to do B.what to do C.
2024-05-032个回答
-
what do you want me to tell your mother Please tell her .abo
2024-05-034个回答
-
Please tell me____to improve my English.为什么填what to do
2024-05-031个回答
-
Please tell me__next?A how to do Bwhat to do C to do what D
2024-05-033个回答
-
Would you please tell me what to do it 对吗,how to do 后面可以接it吗
2024-05-031个回答
-
Please tell me what to do是一个完整的句子吗?what to do是作宾语吗
2024-05-034个回答
你能帮帮他们吗
-
如图在△ABC中,∠ACB是直角,AB=13,AC=12,将△ABC沿射线BC的方向平移一段距离后得到△DCE,那么CD
2024-05-041个回答
-
已知:如图,在△ABC中,∠A是直角,AB=3,AD=4,BC=2分之15,DC=二分之五根号13；①△DBC是直角三角
2024-05-041个回答
-
如图,直角三角形ABC中,∠B是直角,AB=12cm,将三角形ABC绕点c顺时针旋转60°,那么AB扫过的面积是____
2024-05-042个回答
-
烧开的水底部总沉淀一层白色的东西,上面还漂着一层,喝了对身体有害吗?怎么办?
2024-05-041个回答
-
聚乙二醇分解能产生啥东西分解后都有啥物质产生是否有毒?有害?如何检验?
2024-05-041个回答
精彩回答
-
My sister told me she would intruduce( )idiom to me
2024-05-023个回答
-
高二椭圆数学题求解已知三角形ABC的顶点A,B在椭圆x^2+3y^2=4,C在直线L：y=x+2上,且AB平行于L,当角
2024-05-022个回答
-
He told me .she would come or not was not easy to say
2024-05-024个回答
-
.数学题．．轴对称!如果一个三角形两边的垂直平分线的交点在第三边上,那么这个三角形是（ ）． A锐角三角形B钝角三角形C
2024-05-022个回答
-
六年级上册一道数学题（人教版）一个三角形的面积是 25份之13 平方分米,高是 50份之13分米,底十多少分米?（各路英
2024-05-0210个回答