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已知2a-4和a-4是某正数的平方根b-7的立方根为-2.1求ab的值2求a+b的算术平方根.
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下列说法错误的是
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Common isinformationthatmostpeopleknow.Forexampletherearefourseasonsinayear
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BritishphysicistStephenHawkingwho asthesmartestmanalivepassedawayinEnglandonMarch142018.A.praised B.waspraised C.willbepraised
—Light-railvehicle轻轨inourcityintwoyears.—Goodnews.A.builds B.built C.willbebuilt D.isbuilt
PeterisnotgoodatEnglish.Hehastroublememorizethenewwords
如图把Rt△ABC放在直角坐标系内其中∠CAB=90°BC=5点AB的坐标分别为1040将△ABC沿x轴向右平移当点C落在直线y=2x-6上时线段BC扫过区域的面积为
下列手机手势解锁图案中是中心对称图形的是
已知xy为实数且y=+1求x+y的值.
Ifyoupreparewellfor examthenthere'snothingtoworryabout A.a B.an C.the D./
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Agoodlearneroftenthinksabout heneedstopracticemore A.thatB.whatC.whoD.where
若的整数部分是a小数部分是b.求a²+b².
WhenImeetaproblemIamusedtosolvingit myown A.onB.forC.toD.in
如图Rt△ABC中∠C=90°BC=6AC=8.点PQ都是斜边AB上的动点点P从B向A运动不与点B重合点Q从A向B运动BP=AQ.点DE分别是点AB以QP为对称中心的对称点HQ⊥AB于Q交AC于点H.当点E到达顶点A时PQ同时停止运动.设BP的长为x△HDE的面积为y.1用x表示ED的长度2求y关于x的函数解析式3当x为何值时△HDE为等腰三角形
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