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- 2已知△ABC中,AB=2根号下3,AC=2,BC边上的高AD=根号下3,求证 ∠BAC=90°
- 3---Excuse me.Is there a zoo near here?
- 4If the ratio of the degree of exterior angle of∠A,∠B and∠C that are in the triangle ABC is 5:4:3,then the ratio of the d
- 5如图,已知三角形ABC是等腰三角形,AB,AC都是腰,DE是AB的垂直平分线,BE+CE=12厘米,BC=8厘米,求周长.
- 6已知函数f(x)=4x^2-mx+5在区间[-2,负无穷)上是增函数,则m的取值范围是
- 7说明文作文300字
- 8( )I don't know the______the post office.
- 9标有40W,220V;100W,220W,的灯泡,正常工作时的电流分别是多大?电阻各是多少?
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