The food is________________.
A. noisy B. delicious C.friends
odd one out
a.lamps b.fridges c.desks d.laughs
a. kitchens b.beds c. poster d.lights
Cho A= 1=3+3^2+3^3+...+3^2011+3^2012
Chứng tỏ rằng A chia hết cho 13
3. He last wrote to me 3 moths ago
5 điểm
He didn't write to me 3 months ago.
He has written to me for 3 months.
He hasn't written to me for 3 months.
Solution
We have: 3A = 3. (1 + 3 + 32 + 33 + ... + 399 + 3100) (1 + 3 + 32 + 33 + ... + 399 + 3100)
3A = 3 + 32 + 33 + ... + 3100 + 31013 + 32 + 33 + ... + 3100 + 3101
Inferred: 3A - A = (3 + 32 + 33 + ... + 3100 + 3101) - (1 + 3 + 32 + 33 + ... + 399 + 3100) (3 + 32 + 33 + ... + 3100 + 3101) - (1 + 3 + 32 + 33 + ... + 399 + 3100)
2A = 3101−13101−1
⇒⇒ A = 3101−123101−12
So A = 3101−12
Please help me
In how many fields are the prizes bestowed?- "........"
a. It has 3 b. There are 3 fields c. There is 3 field. d. There are 3 fieldes.
dat 3 cau phu dinh 3 cau khang dinh 3 câu hỏi không có từ để hỏi 3 câu hỏi có từ để hỏi của thì quá khứ tiếp diễn
c) 3,4.0,7 + 3,4.0,3 - 0,4 d ) (1 -- \(\dfrac{ 1 }{2 }+\dfrac{ 3 }{ 4 }\)) -- ( \(\dfrac{ 1 }{ 2 } +1\dfrac{ 3 }{ 4 } - 3\)
a, 32 x 24 x 5 : [ 41 - ( 2 x x + 5 ) = 23 x 5.
b, 2 x 3x = ( 2 x 32 ) x 27.
c, {[( 2 x x + 14) : 22 - 3 ] : 2 } = 1.