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Ex 5 Passive voice : The past continuous tense
21 He was painting the house when I came
=> The house was being painted when I came
22 The teacher was reading the book when we cam
=> The book was being read by the teacher when we came
23 Mary's mother was washing the clothes
=> the clothes were being washed by Mary's mother
24 Her friends were drinking coffee at the cafe
=> Coffe was being drunk at the cafe by her friends
25 He was boiling the eggs when I saw him
=>the eggs were being boiled by him when I saw him
#Yumi
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Ta có = 2α => Trong tam giác OKA có:
AK = OA.sin. => AK = a.sin2α
OK =OA.cos. => OK = a.cos2α
![](https://rs.olm.vn/images/avt/0.png?1311)
Ex3 passive voice : The future simple tense
1 They won't punish him => HE WON'T BE PUNISHED
2 They will ask you a lot of question at the interview => A LOT OF QUESTION WILL BE ASKED BY YOU THE INTERVIEW
3 They will give her a new one => SHE WILL BE GIVEN A NWE ONE
4 Tom will visit his parents next month => HIS PARENTS WILL BE VISITED BY TOM NEXT MONTH
5 Some people will interview the new president on TV => INTERVIEW THE NEW WILL BE PRESIDENTED ON TV BY SOME PEOPLE
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a) Đúng b) Đúng
c) Hai vectơ = ( 5; 3) và
= (3; 5) không cùng phương nên không thể đối nhau, do vậy câu c) sai
d) Đúng
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= 3;
= -5. Từ đây ta có
= 3
,
= -5
và suy ra
= –
=>
và
là hai vectơ ngược hướng.
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Ta có: BC2 = AC2 + AB2 – 2AB.AC. cos1200
=> BC2 = m2 + n2 – 2m.n ()
=> BC2 = m2 + n2 + m.n
=> BC =
Ta có
a2 = 82 + 52 – 2.8.5 cos 1200 = 64 + 25 + 40 = 129
=> a = √129 ≈ 11, 36cm
Ta có thể tính góc B theo định lí cosin
cosB = =
≈ 0,7936 =>
= 37048’
Ta cũng có thể tính góc B theo định lí sin :
cosB = =
=> sinB ≈ 0,6085 =>
= 37048’
Tính C từ = 1800– (
+
) =>
≈ 22012’
![](https://rs.olm.vn/images/avt/0.png?1311)
a) Nối BM
Ta có AM= AB.cosMAB
=> || = |
|.cos(
,
)
Ta có: .
= |
|.|
| ( vì hai vectơ
,
cùng phương)
=> .
= |
|.|
|.cosAMB.
nhưng ||.|
|.cos(
,
) =
.
Vậy .
=
.
Với .
=
.
lý luận tương tự.
b) .
=
.
.
=
.
=> .
+
.
=
(
+
)
=> .
+
.
=
= 4R2
Tiếng Anh 10
ko khác nhau và đều là đầu trang