亚洲男人天堂av,国产一区二区久久精品,国产精品一区二区久久精品,国产精品久久久久久一区二区三区,五月婷婷在线观看视频,亚洲狠狠色丁香婷婷综合

歡迎您訪問數(shù)學考題練習:已知,那么的值為!

數(shù)學考題練習:已知,那么的值為

更新時間:2024-01-12 12:59:25作者:貝語網(wǎng)校

已知,那么的值為

A.±

B.±1

C.±

D.±

試題答案

B

試題解析

先把進行配方,得出()2=x-2+,再把代入即可求出答案.

解答:∵,()2=x-2+=x-2=3-2=1,

∴=±1,

故選B.

點評:本題考查了配方法的應用,根據(jù)完全平方公式對要求的式子進行變形是解題的關(guān)鍵,是一道基礎(chǔ)題.

為您推薦

數(shù)學考題練習:下面四個命題中,正確的一個是

下面四個命題中,正確的一個是A.平分一條弦的直徑必垂直于這條弦B.平分一條弧的直線垂直于這條弧所對的弦C.圓心角相等,圓心角所對的弧相等D.在一個圓中,平分一條弧和它所對弦的直線必經(jīng)過這個圓的圓心

2024-01-12 12:59

數(shù)學考題練習:在平面直角坐標系中有兩點A(7,3),B(7,

在平面直角坐標系中有兩點A(7,3),B(7,0),以點(1,0)為位似中心,位似比為1:3.把線段AB縮小成A′B′,則過A點對應點A′的反比例函數(shù)的解析式為________.

2024-01-12 12:59

數(shù)學考題練習:直線y=kx+b經(jīng)過A(2,1),B(-1,-

直線y=kx+b經(jīng)過A(2,1),B(-1,-2)兩點,求關(guān)于x的不等式kx+b≤0的解集.

2024-01-12 12:59

數(shù)學考題練習:甲安裝隊為A小區(qū)安裝66臺空調(diào),已安裝隊為B小

甲安裝隊為A小區(qū)安裝66臺空調(diào),已安裝隊為B小區(qū)安裝60臺空調(diào),兩隊同時開工且恰好同時完工,甲隊比乙隊每天多安裝2臺,若設(shè)乙隊每天安裝x臺,則下面所列方程中,正確的是A.=B.=C.=D.=

2024-01-12 12:59

數(shù)學考題練習:一次函數(shù)y=ax+b的圖象經(jīng)過點A,點B,如圖

一次函數(shù)y=ax+b的圖象經(jīng)過點A,點B,如圖所示,則不等式ax+b>0的解集是A.x<-2B.x>-2C.x<1D.x>1

2024-01-12 12:59

數(shù)學考題練習:在下列命題中,真命題是

在下列命題中,真命題是A.有一個角是直角的四邊形是矩形B.有一個角是直角且一組鄰邊相等的四邊形是正方形C.有兩邊平行的四邊形是平行四邊形D.兩條對角線互相垂直平分的四邊形是菱形

2024-01-12 12:59

加載中...
主站蜘蛛池模板: | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |