C = 35 + 38 + 41 +……….92 + 95
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ƯCLN(77;126)
77 = 11 x 7
126 = 2 x 33 x 7
=>ƯCLN (77;126) = 7
TL:
ƯCLN (77;126)
77 = 11 x 7
126 = 2 x 33 x 7
=>ƯCLN (77;126) = 7
HT


Các ước nguyên tố của 36 : 2 ; 3 .
Các ước nguyên tố của 49 : 7 .
Các ước nguyên tố của 70 : 2 ; 5 ; 7 .

1. There are many flowers in our garden.
→ Our garden has many flowers.
2. The garden is behind Linh’s house.
→ Linh’s house is in front of the garden.
3. We have six chairs, a table, a television and a ceiling fan in our living room.
→ There are six chairs , a table , a television and a ceiling fan in their living room.
4. I don’t have a computer in my bedroom.
→ There isn't a computer in my room.
5.Mary’s hair is short and her face is round.
→ Mary has short hair and round face.
6.My house is next to a big super-market.
→ There is a big super - market next to my house.
7. The cat is in front of the computer.
→ The computer is behind the cat.
8. This book belongs to my mum.
→ This is my mum's book.
9. Tom s P.E the best.
→ P.E is Tom's favourite subject.
10. What is your favourite room?
→ What room do you l.ike ?


TL;
A = { x E N / 50 ; 51 ; 52 ; 53 ; 54 ; 55 ; 56 ; 57 ; 58 ; 59 ; 60 ; 61 ; 62 ; 63 ; 64 ; 65 ; 66 ; 67 ; 68 ; 69 ; 70 }
B = { 2 ; 4 ; 6 ; 8 ; 10 ; 12 ; 14 ; 16 ; 18 ; 20 ; 22 ; 24 }
C = { 10 ; 20 ; 30 ; 40 ; 50 ; 60 ; 70 ; 80 ; 90 ; 100 ; 110 ; 120 ; 130 ; 140 ; 150 ; 160 }
D = { 2 ; 4 ; 6 ; 8 ; 10 ; 12 ; 14 ; 16 ; 18 ; 20 ; 222 ; 24 ; 26 ; 28 }
Có số số hạng là :
( 95 - 35 ) : 3 + 1 = 21 ( số )
Tổng trên là :
( 95 + 35 ) x 21 : 2 = 1365
Đ/S : 1365
= 1365