1、MH
: hemoglobin
=
1
: 4 (this can be easily obtained from the similarity relation in Rt△MCB)
.
2. Then use Pythagorean theorem to get MH= 1/√5.
For the convenience below, MH is taken as the unit length a.
, so MB
=
5a
3、∠AHM=45
(Applying the conclusion of the second question to this point, we can see that ∠AHM=∠BAC, not much explanation) This point is very useful!
4. do AZ⊥BM at point z (then z is on the BM extension line). Using information 3, we know that △AZH is isosceles Rt△.
5, due to AZ
//
Knights of Honor
and
If m is the midpoint of AC, then m is also the midpoint of ZH, so ZH = 2A = ZA and AH = 2 √ 2.
a
，ZB=ZM+MB=6a
Then there are three situations:
1, the simplest one: AD=AH=2√2.
a=2√ 10
/
five
2、AD=DH:
Connecting ZD, it is found that △ZAD and △ZHD are congruent (S.S.S congruence), so ZD is the bisector of ∠AZB angle.
So AD
:DB
=
Azerbaijan (short for Azerbaijan)
:ZB
=
2a
:6a
=
1
:3
AB=√2
ab blood type
=
2√2
, so
AD=
AB/
four
=
√2/2
3、AH=HD:
MX⊥AB in X exceeds M, and HY⊥AB in Y exceeds H.
Through MX
//
[Man's first name] Henry
Fred: Hi.
:MX
=
Half board and lodging
:MB
=
4a
:5a
=
four
:5
In isosceles Rt△AXM, AM= 1, so MX.
=
√2
/
2
, so HY
=
2
√2
/
five
You ah
=
2√2
a
=
2√2
/
√5
It is found that Rt△AYH is 1: 2: √ 5 again.
The structure of (you still use Pythagorean theorem to write directly in one step), so AY=2.
[Man's first name] Henry
=
four
√2
/
five
In isosceles △AHD, HY is the AD midline of the base, so AY=YD, so AD=
2
affirmative vote
=
eight
√2
/
five
In this case, your denominator is wrong.
Add a few points:
1, I think this is relatively simple.
2. Is there an angular bisector theorem in the junior high school syllabus? I don't remember. If not, just check. The basic theorem of plane geometry is still very important and easy to use.
As a college student, I may not be as detailed as I was in Grade Three, but I hope you can understand.
4. I took out some useful information first. You can use this format when you write the proof, or you can put the useful information into the corresponding three situations step by step to prove it. Logically, the latter is clearer, but the overall grasp of the former is more hierarchical, depending on which one you adapt to. To be on the safe side, you should use the former, because I don't remember the grading standards of that year. You may lose points if you write with the latter, so you have to take an exam.
As a candidate in Zhabei, I wish you a smooth college entrance examination.