Giúp mk với ạ
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![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
a) ĐKXĐ:
x³ - 1 khác 0
x khác 1
b) A = (5x² + 5x + 5)/(x³ - 1)
= 5(x² + x + 1)/[(x - 1)(x² + x + 1)]
= 5/(x - 1)
Thay x = 7 vào A, ta được:
A = 5/(7 - 1)
= 5/6
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
1 send - will receive
2 do - will improve
3 find - will give
4 will go - has
5 will go- gets
6 doesn't phone - will leave
7 don't study - won't pass
8 rains - won't have to
9 won't be able - watch
10 can't move - isn't
11 study - will pass
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
1 me
2 too
3 done
doing
having
4 interested
5 as to
6 standing
when
7 helping
8 too
9 such
a
10 used
11 when
12 shouldn't
13 is - cost
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
Áp dụng tính chất của dãy tỉ số bằng nhau, ta được
\(\dfrac{a}{3}=\dfrac{b}{4}=\dfrac{b-a}{4-3}=23\)
Do đó: a=69; b=92
![](https://rs.olm.vn/images/avt/0.png?1311)
Chào em, em tham khảo nhé!
1. won't finish
2. had learnt
3. is
4. didn't rain
5. had gone
6. hadn't told
7. would understand
8. will throw
9. would be
10. will post
11. will go
12. is hitting
13. won't do
14. will make
15. will go
16. go
17. eat
18. was washed
19. will be built
20. was cleaned
Chúc em học tốt và có những trải nghiệm tuyệt vời tại hoc24.vn!
![](https://rs.olm.vn/images/avt/0.png?1311)
1 C => hers
2 B => will use
3 D => their
4 A => will be pedaling
5 A => travel
6 C => less
7 D => have they
8 D => than
9 A => worked
10 B => fewer
![](https://rs.olm.vn/images/avt/0.png?1311)
1) Trong (O) có AE là dây cung không đi qua O có H là trung điểm AE
\(\Rightarrow OH\bot AE\Rightarrow\angle OHI=90\) mà \(\angle OBI=90\Rightarrow OBIH\) nội tiếp
2) OBIH nội tiếp \(\Rightarrow\angle BIO=\angle BHO\)
Vì \(AB\) là đường kính \(\Rightarrow\angle AEB=90\Rightarrow EB\bot AE\) mà \(OH\bot AE\)
\(\Rightarrow OH\parallel BE\Rightarrow \angle BHO=\angle HBE\Rightarrow \angle HBE=\angle BIO\)
3) Vì \(\left\{{}\begin{matrix}KH\bot AI\\AB\bot KI\end{matrix}\right.\Rightarrow\) O là trực tâm \(\Delta IAK\Rightarrow IO\bot AK\Rightarrow\angle ODA=90\)
mà \(\angle OHA=90\Rightarrow OHAD\) nội tiếp
Tương tự \(\Rightarrow\) ODKB,AHBK nội tiếp
Ta có: \(\angle HDO=\angle HAO=\angle HKB=\angle ODB\Rightarrow\) DI là phân giác \(\angle HDB\)