Let x=0 and y=8.
Let y=0 and x=6.
∴A(6,0),B(0,8)，
∴OA=6,OB=8 AB= 10，
∫A B ' = AB = 10，
∴O B'= 10-6=4，
The coordinates of ∴B' are: (-4,0).
(2) Solution: y=-4/3x+8
Get a (6,0), b (0,8)
BA= 10 from Pythagorean Theorem
According to the meaning of the question, m is a point on OB. If △ABM is folded along AM, the point B falls on the point B' on the X-axis.
Then AM is ∠BAO bisector
Let MD⊥AB become D.
Let mo = MD = H.
From the area of 6h/2+ 10h/2=6*8/2.
The solution is h=3.
That is, the coordinate of point m is m (0,3).
Let the analytical formula of straight line AM be y = kx+b.
Then 6k+b=0 and 0k+b=3.
The solution is k=-0.5 and b=3.
Therefore, the analytical formula of straight line AM is y=-0.5x+3.
27. Proof: (1) As shown in the figure, ∫∠BAC = 90, AF⊥AE.
∴∠EAB+∠BAF=∠BAF+∠FAC=90，
∴∠EAB=∠FAC，
∵BE⊥CD，
∴∠BEC=90，
∴∠EBD+∠EDB=∠ADC+∠ACD=90，
∫∠EDB =∠ADC，
∴∠EBA=∠ACF，
∴ in △AEB and △AFC,
∠EAB=∠FAC
AB=AC
∠EBA=∠ACF
∴△AEB≌△AFC(SAS)
∴ae=af；
(2) As shown in the figure, the intersection point A is AG⊥EC, and the vertical foot is G. 。
∵AG⊥EC,BE⊥CD，
∴∠BED=∠AGD=90，
∵ Point is the midpoint of AB,
∴BD=AD.
△ ∴and△ △AGD on the bed,
∠ Bed =∠AGD
Bromdiphenyl ether = ADG
BD=AD
∴△BED≌△AGD(AAS)，
∴ED=GD,BE=AG，
AE = AF
∴∠AEF=∠AFE=45
∴∠FAG=45
∴∠GAF=∠GFA，
∴GA=GF，
∴CF=BE=AG=GF，
∫CD = DG+GF+FC，
∴CD=DE+BE+BE，
∴CD=2BE+DE.
28.( 1) ∠ CMQ = 60 remains unchanged.
In an equilateral triangle, AB=AC, B = Cap = 60.
And the condition AP=BQ,
∴△ABQ≌△CAP(SAS)，
∴∠BAQ=∠ACP，
∴∠cmq=∠acp+∠cam=∠baq+∠cam=∠bac=60。
(2) Let time be t, then AP=BQ=t and Pb = 4-t..
① When ∠ PQB = 90,
∫∠B = 60，
∴PB=2BQ，4-t=2t，t=4/3。
② When ∠ BPQ = 90,
∫∠B = 60，
∴BQ=2BP，t=2(4-t)，t=8/3。
When t=4/3 or t=8/3, △PBQ is a right triangle.
(3) ∠ CMQ = 120 remains unchanged.
In an equilateral triangle, AB=AC and B = Cap = 60.
∴∠PBC=∠ACQ= 120，
According to the conditions, BP=CQ,
∴△PBC≌△QCA(SAS)
∴∠BPC=∠MQC
∠∠PCB =∠MCQ，
∴∠cmq=∠pbc= 180-60 = 120
No.2 Middle School of Zhangjiagang City has different answers to the first semester of the 2065 438+03-2065 438+04 school year. Don't ask.
20 10~20 1 1 where are the papers in the first semester of the school year, which school and which edition? 、
20 14-20 15 answers to the first semester mathematics examination paper.
My grades are also above average.
I recite history and politics every day, and I keep reading textbooks to do problems.
Write down what you don't understand, and focus on what you missed before next time.
20 1 1 Is the mid-term examination paper and answer of chemistry in the third semester of the school year coming soon?
The school newspaper answers students' midterm papers in the first semester of the sixth grade 2013-2014 school year. Please your parents come to my office tomorrow morning.
In the 2008 school year, the first semester of the third grade mathematics midterm examination paper 1.5: 2.
2. 1:3
3.2
4.2:5
5. 1:4
6 16:9
7.∠ACD=∠ADC
8. 1:3
9. Root number 2: 2
10. Vector CD
1 1.-3 2a vector +b vector
12. Root number 2
13.c
14.d
15.b
16.c
17.72
Figure 6.7: 96
22.480 and 768
23 ( 1).y = 65438+2-5 2X。
(2).5/4
In the first semester of the 2009 school year in Shanghai, the answer to the senior two mathematics test paper of 20 senior high schools is-1 times 2n- 1.
Luoyang senior one, 20 13-20 14 school year, I suggest you post the questions after the mid-term exam in the first semester, otherwise it is impossible to get the answers like this.
What happened to the English test paper LZ in the first semester of 2008-2009 school year?