hgj u mlkiouploi
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a)
Xét \(\Delta\) vuông HNI và \(\Delta\)vuông GOJ, có:
góc IHN = góc JGO ( đ/nghĩa hình thang cân)
IH = JG (t/chất hình thang cân)
=> \(\Delta HNI=\Delta GOJ\) (ch+1gn)
=>HN = OG (2 cành tương ứng)
b) Xét \(\Delta HJI\) và \(\Delta GIJ\) có:
HJ = GI (t/chất hình thang cân)
IH = JG (cmt)
JI là cạnh chung
=> \(\Delta HJI\) = \(\Delta GIJ\) (c.c.c)
=> góc IHJ = góc JGI (2 góc t.ứng)
vì \(\widehat{IHJ}=\widehat{JHI}\left(cmt\right)\)
\(\widehat{IHG}=\widehat{JGH}\left(cmt\right)\)
=>\(\widehat{IHG}-\widehat{IHJ}=\widehat{JGH}-\widehat{JGJ}\)
hay \(\widehat{JHG}=\widehat{IGH}\)
vì IJ//HG (gt)
=> \(\widehat{GIJ}=\widehat{IGJ}\left(slt\right)\)
=> \(\widehat{IJH}=\widehat{JHG}\)
mà \(\widehat{JHG}=\widehat{IGH}\)
\(\Rightarrow\widehat{GIJ}=\widehat{HJI}\)
hay \(\widehat{PIJ}=\widehat{PJI}\)
=> \(\Delta PIJ\) cân tại P
=> PI = PJ (đpcm)
vì HJ = GI (cmt)
PJ = PI (cmt)
=> HJ - PJ = GI - PI
hay PH = PG (đpcm)
Tìm lỗi sai và sửa lại :
1. What subjects do students to study at secondary school ? => study
2. Would you like going on an excursion with my class? => to go
3. My sister has decided become teacher of history at school. => to become
4. Last Sunday I stayed at home to make my homework => do
5. What languages can you say fluently? => speak
6. Can you speak more slow,please? => slowly
7. I’m keen in learning languages => on
8. How long does Minh stay in Da Lat - one of the most beautiful place in Viet Nam ? => places
9. Let’s to get up early and go for a walk before breakfast => get
10. Do you mind if I sitting near the window? => sit
1.a.meet b.see c.feet d.cheer
2.a.seaside b.sugar c.sick d.so
3.a.next b.desk c.test d.delicious
4.a.lovely b.friendly c.my d.slowly
5.a.these b.this c.thin d. those
6.a.fish b.library c.list d.miss
7.a.lunch b.mum c.study d.future
8.a.chicken b.teacher c.chemistry d.chair
9.a.hour b.hot c.hight d.house
10.a.second b.tell c.meter d welcome
In đậm là chọn nha!
1. man fan fat table
2.that make take cake
3. gun fun sun june
4. above glove love move
5. clear dear hear pear
6. cost most post roast
7. cow now how show
8. hi fine night children
9. happy fly sky dry
10. find thing nine wine
11. clown down own town
12. cow show know throw
13. thank that this those
14. come home some none
15. name classmate paper thank
16. old morning bingo hello
1. table
2. that
3. june
4. move
5. pear
6. post
7. show
8. children
9. happy
10. thing
11. own
12. throw
13. thank
14. home
15. thank
16. morning
=dgfhsúegh
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