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如图,Rt△ABC中,∠ACB=90°,AC=3,BC=6,以C为圆心、CA长为半径画弧,交斜边AB于D,求AD的长
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在Rt△ABC中∠ACB=90°AC=6BC=4.将△ABC绕直角顶点C.顺时针旋转90°得到△DE
如图17Rt△ACB中∠ABC=90°点D.E.在AB上AC=ADBE=BC则∠DCE的大小是___
如图在Rt△ABC中∠ACB=90°AC=6BC=4将△ABC绕直角顶点C.顺时针旋转90°得到△D
如图Rt△ABC中∠ACB=90°AC=BC=2若把Rt△ABC绕边AB所在直线旋转一周则所得几何体
在Rt△ABC中∠ABC=90°AC=5BC=3CD是∠ACB的平分线将△ABC沿直线CD翻折点A落
如图已知Rt△ABC中∠ACB=90°AC=6BC=4将△ABC绕直角顶点C.顺时针旋转90°得到△
如图在Rt△ABC中∠ACB=90°AC=BC=1将Rt△ABC绕A.点逆时针旋转30°后得到Rt△
如图在Rt△ABC中∠ACB=90°AC=8BC=6CD⊥AB垂足为D则tan∠BCD的值是.
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2.5
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如图在Rt△ABC中∠ACB=90°以点
为圆心,AC长为半径作圆弧交边AB于点D.若 AC=3,BC=4.则BD的长是( )
A.2
3
4
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如图4240在Rt△ABC中∠ACB=90°AC=3BC=4以点A.为圆心AC长为半径画弧交AB
如图Rt△ABC中∠ACB=90°AC=BC=2若把Rt△ABC绕边AB所在直线旋转一周则所得几何体
如图在Rt△ABC中∠ACB=90°CD是AB边上的高AC=6AB=9则AD=
2
3
4
5
如图4240在Rt△ABC中∠ACB=90°AC=3BC=4以点A.为圆心AC长为半径画弧交AB
已知如图在Rt△ABC中∠ACB=90°CD⊥AB于点D.若AC=4BC=3则CD=________
如图在Rt△ABC中∠ACB=90°AC=BC=2将Rt△ABC绕点A.逆时针旋转30°后得到Rt△
如图在Rt△ABC中∠ACB=90°AC=3BC=4以AC为直径的圆交AB于点D.求BDCD的长.
如图1168在Rt△ABC中∠ACB=90°CD⊥ABAC=6AD=3.6则BC=_______
如图已知Rt△ABC中∠ACB=90°AC=6BC=4将△ABC绕直角顶点C.顺时针旋转90°得到△
如图在Rt△ABC中∠ACB=90°AC=6BC=8AD是∠BAC的平分线.若P.Q.分别是AD和A
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若xy满足|x-3|+=0则的值是A.1 B. C. D.
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下列含碳物质属于氧化物的是A.C60 B.CH4 C.CaCO3 D.CO
下面是木炭和一氧化碳分别与氧化铜反应的实验示意图.1写出一氧化碳与氧化铜反应的方程式2两个实验中发生还原反应的物质是3A实验酒精灯上加网罩的目的是①B实验在出气导管口处放燃着酒精灯的目的是②
的平方根是
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已知x-12平方根是±2x-y-6的立方根是2求xy的算术平方根
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计算-14-÷-2+|-3|3
求下列各式中x的值x+103=343
若规定用符号[m]表示不超过个实数m的最大整数.例如[]=0[3.14]=3则按此规定[+1]=.
减少二氧化碳排放减缓全球气体变暖是当今世界要解决的重大环境问题这一问题的解决对人类社会的发展极为重要.为减缓大气中二氧化碳含量的增加以下建议和说法可行的是①促进节能产品的开发和普及②人工吸收二氧化碳③温室效应对人类只有害没有益处④低碳就是较低的一氧化碳排放
求下列各式中x的值x3+2=1
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分析鉴别一氧化碳和二氧化碳气体的不同方法并回答问题若将两种气体分别通入水中能否鉴别开两种气体选填能或不能
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下列各数中--π-0.1010010001无理数有A.2个 B.3个 C.4个 D.5个
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