在锐角三角形abc中,∠a=45°cosA,cosB是方程4x²-2（1+√2）x+m=0的两个,且Ac=√2求（1）∠B的度数；（2）AB的长
cosA=√2/2将x=√2/2代入4x²-2(1+√2)x+m=02-2×(1+√2)×√2/2+m=0m=√2韦达定理x1×x2=m/4=√2/4cosB=（√2/4）/（√2/2）=1/2B是锐角B=60度C=180-A-B=75度sin75=(√6+√2)/4这个要记住正弦定理AC/sinB=AB/si...
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12ab≤a^12 b^1220abx12-20x 0y-20=12→
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2013高考数学(文)二轮复习配套作业(解析版)作业手册详,地理二轮复习,高中数学二轮复习,高考历史二轮复习,高三二轮复习策略,高中生物二轮复习,数学二轮复习,新文化运动二轮复习,数学二轮复习序言,二轮滑板
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3秒自动关闭窗口1+1+1+1+1+1+1+1+1+1-1+1+1+1+1+1+1x0 =?
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Please Excuse My Dear Aunt Sally
First 5 or so responses are some of the biggest fails I've ever seen here.
Joined: Sep 07
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Originally Posted by voorh33s
Please Excuse My Dear Aunt Sally
First 5 or so responses are some of the biggest fails I've ever seen here.
it was only because i didnt see the -. didnt think it was 0 fwiw
Jay Bilas of Golf
Joined: Jan 06
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Originally Posted by The Alchemist
14? how tho? I could kinda see how a moron would get 10, but 14? wut
Joined: Mar 09
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Originally Posted by coolhandkev
This is exactly why you should cross your 7's and leave your 4's open
Frownyface.jpg
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[1+1+1+1+1+1+1+1+1+1] - [1] + [1+1+1+1+1] + [1x0] = 14
Break it down...
1+1+1+1+1+1+1+1+1+1 = 10
9+1+1+1+1+1= 14
14 + (1x0) = 14
My method is totally wrong but I get the right answer.
*edit* my brackets were only meant to break down the equation...pay no attention to them
Edited By: Mr. Blonde Jun 14th, 2011 at 11:04 PM
Joined: Oct 07
Jun 14th, /pm)
only multiply first if it is in brackets, otherwise left to right
Joined: Jan 11
Jun 14th, /pm)
Originally Posted by Niceguy
These poorly written math problems just proves one thing.
People on facebook have way too much time on their hands.
That makes no sense. If they had a ton of time they would probably write it correctly. It looks like who ever created this problem did it quickly without much time or thought. Plus if it was written in an easy clear concise manner it would be easy to solve.
The point of the problem is to confuse people so they get it wrong and apparently it is working. Looks like you don't think things through much there smartypants.
Edited By: snizzow Jun 14th, 2011 at 11:42 PM
Joined: Oct 06
Jun 14th, /pm)
I mean, this isn't even a poorly written expression like the last one. Before you could see how someone might mess it up. Here, kill self immed if you get it wrong.
Jay Bilas of Golf
Joined: Jan 06
Jun 14th, /pm)
Originally Posted by dangood1
only multiply first if it is in brackets, otherwise left to right
Brackets are not needed, it is understood when you have addition/subtraction and multiplication/division in the same equation.
I will find you.
Joined: Jul 06
Jun 14th, /pm)
Originally Posted by snizzow
That makes no sense. If they had a ton of time they would probably write it correctly. It looks like who ever created this problem did it quickly without much time or thought. Plus if it was written in an easy clear concise manner it would be easy to solve.
The point of the problem is to confuse people so they get it wrong and apparently it is working. Looks like you don't think things through much there smartypants.
It's much harder to poorly write an expression then you may think.
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Jun 15th, /am)
Joined: Dec 08
Jun 15th, /am)
answer is 0
Joined: Aug 08
Jun 15th, /am)
MS excel says there's an error in the equation as written. I'll go with Bill Gates as my answer.
Joined: Dec 07
Jun 15th, /am)
notsureifserious.jpg
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Jun 15th, /am)
Joined: Jan 07
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Do people seriously not remember pemdas? I hate this country sometimes....
Joined: Jun 07
Jun 15th, /am)
Originally Posted by dangood1
only multiply first if it is in brackets, otherwise left to right
Well u got the P right, but u forgot about the EMDAS
Joined: Oct 07
Jun 15th, /am)
Anyone who doesn't sit there and carefully read the equation is going to miss the - sign, then obviously get it wrong.
This is irrelevant to anyone answering 0 obviously, because that's just simply not understanding that the x0 at the end doesn't mean the entire equation is multiplied by zero-in other words must have missed third grade.
Butttttt the equation is written terribly-on purpose, but still written horribly.
I will find you.
Joined: Jul 06
Jun 15th, /am)
^^^^ this chick is always high and if she can figure it out.......
Edited By: Niceguy Jun 15th, 2011 at 02:11 AM
Joined: Oct 07
Jun 15th, /am)
LOL I stopped getting high on the daily years ago and stopped completely awhile ago, ass.
Joined: Apr 07
Jun 15th, /am)
Correct answer is, as mentioned, 14
Joined: Jun 07
Jun 15th, /am)
Originally Posted by Roundelay
Correct answer is, as mentioned, 14
correct answer to how many times the OP should post per day is 0
Joined: Jul 06
Jun 15th, /am)
Put &1+1+1x0& into a calculator. If you can't figure it out after that, give up on math.
Edited By: LoveHatePoker Jun 15th, 2011 at 06:16 AM
Joined: Feb 08
Jun 15th, /am)
Joined: Jun 11
Jun 15th, /am)
O.O so this is why people have been adding me on facebook the past few hours oneonf them finally send me the link to this post lol holy crap
Joined: Mar 11
Jun 15th, /am)
Originally Posted by Eizen Telvantis
O.O so this is why people have been adding me on facebook the past few hours oneonf them finally send me the link to this post lol holy crap
You're famous :)
Joined: Jun 11
Jun 15th, /am)
actually if you read the yahoo answers i posed the (1x0) in the question
Joined: Mar 11
Jun 15th, /am)
Originally Posted by Eizen Telvantis
actually if you read the yahoo answers i posed the (1x0) in the question
Now that you're here, I have a question for you. There's been a long standing debate here about who is hotter: Angie Varona or Kate Upton
Angie Varona
Kate Upton
Joined: Jan 06
Jun 15th, /am)
I'm always proud of my facebook friends when none of these things reach me. So proud that I have now removed the quotation marks around &friends.&
Originally Posted by edwardt1988
Now that you're here, I have a question for you. There's been a long standing debate here about who is hotter: Angie Varona or Kate Upton
Angie Varona
Kate Upton
question is poorly formed without rosie jones
edit: chick gets naked unlike those two uptight bitches.
Edited By: keylight Jun 15th, 2011 at 06:23 AM
Joined: Jun 11
Jun 15th, /am)
O.O cant answer cant i has both?
@Keylight ermm all three? lol jk
it would seem that way lol
Edited By: Eizen Telvantis Jun 15th, 2011 at 06:22 AM
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Aug 16th, 2016已知圆M过两点A（1,-1）B（-1,1）且圆心M在x+y-2=0上.（1）求圆M的方程.（2）设P是直线3x+4y+8=0上的动点,PCP、DM是圆M的两条切线,C、D为切点,求四边形PCMD的面积的最小值.
oxYW80DO86
(1)点A、B中点（0,0）AB的中垂线为y=x所以,圆M的圆心M（1,1）（1,1）与（-1,1）的距离为2所以圆M的方程（x-1）^2+(y-1)^2=4(2)四边形PCMD=△PCM+△PDM△PCM、△PDM均为直角三角形,当四边形PCMD为正方形时,四边形PCMD面积最小,为4
万分感谢 麻烦你再去看看我发的其他题 谢谢!
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就靠你了 大神 明天开学!
18、（Ⅰ）由正弦定理，sinA=a/(2R)，sinB=b/(2R)，sinC=c/(2R)，代入已知sinA+sinC=psinB中，得
a+c=5/4，ac=1/4，即4a^2-5a+1=0,解此一元二次方程，a1=1/4,a2=1,所以a=1/4,c=1或
a=1,c=1/4。
(2)(a+c)/b=p>0
(a^2+2ac+c^2)/b^2=p^2
因为ac=1/4b^2
带入 且a^2+c^2=b^2+1/2b^2CosB 带入 则3/2+1/2CosB=p^2 又因为B是锐角 0<CosB<1 所以3/2<p^20,故解得：根号6/2<p<根号2。
（1）∵直三棱柱ABC-A1B1C1
∴平面A1ABB1⊥平面ABC
∵∠ACB=90°，AC=BC=2
∴△ABC是等腰直角三角形
∵F是AB中点，
∵CF属于平面ABC
∴CF⊥平面ABB1
（2，3）/math2/ques/detail/89bf2e47-aa53-465c-a1b7-d5bc
22、/math2/ques/detail/1ae8ac6d-82e7-46b6-9ef2-67e0c505766f
题目太多了~因为我也懒，所以……
你自己写吧，我们还有很多没教，像抛物线，概率之类的
我半个月没碰过书 写题还得翻公式 你也不用手打解题过程给我了 拍下来就行 大神我就靠你了 你要什么我尽量满足啊T^T
因为我家电脑的原因，传不上去，只能放网盘里，你自己下吧
好 我怎么下...
电脑上，或者是在手机上安装解压的……
明天真的开学了T^T
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