Rt△ABC中,∠C=90°,D是AB的中点,∠A=4∠B,则∠DCB=______°.
Rt△ABC中,∠C=90°,D是AB的中点,∠A=4∠B,则∠DCB=______°.
background:url(2、png),url(1、jpg),url(3、png),url(4、jpg);},表示哪张图片处在最上层() A: 2、png B: 1、jpg C: 3、png D: 4、jpg
background:url(2、png),url(1、jpg),url(3、png),url(4、jpg);},表示哪张图片处在最上层() A: 2、png B: 1、jpg C: 3、png D: 4、jpg
如图在△ABC中,∠ACB=90°,CD⊥AB于D,AC=4,BC=3,则cos∠DCB=______.
如图在△ABC中,∠ACB=90°,CD⊥AB于D,AC=4,BC=3,则cos∠DCB=______.
188
188
In 1803 the United States purchased Louisiana from _____.
In 1803 the United States purchased Louisiana from _____.
When was Ralph Waldo Emerson born? A: January 4, 1801 B: May 25, 1803 C: August 30, 1806 D: December 31, 1800
When was Ralph Waldo Emerson born? A: January 4, 1801 B: May 25, 1803 C: August 30, 1806 D: December 31, 1800
background: url(2、png),url(1、jpg),url(3、png),url(4、jpg);},表示哪张图片处在最上层()。
background: url(2、png),url(1、jpg),url(3、png),url(4、jpg);},表示哪张图片处在最上层()。
血压188
血压188
In 1803, President Jefferson negotiated the purchase of Louisiana from Mexico.
In 1803, President Jefferson negotiated the purchase of Louisiana from Mexico.
png的最优值是() A: -2 B: -6 C: -45/4 D: -7
png的最优值是() A: -2 B: -6 C: -45/4 D: -7