cac bn oi giup mk vs mk dg can gap

mk dg can gaap cac bn oi

Ta xét :

\(\frac{4n+1}{5n+1}\)là số tự nhiên

\(\frac{6n^2+6n+1}{4n+1}\)là luỹ thừa với sô tự nhiên

Ta gọi n là số nguyên tố 4n² x 5n6 . Vậy ta suy ra n là số tối giản nguyên tố chia hết cho 6

Ta có : n² + 6n1 = 1² + 6n¹ = Ta suy ra n là  nguyên tố tối giản

Tao ngu tao ko biết

Mày ko biết à !hả ?

Tao ngu lắm !

Hahaha

a)a) - Xét tổng :

(5a+8b)+2(−a+2b)(5a+8b)+2(-a+2b)

=5a+8b−2a+4b=5a+8b-2a+4b

=3a+12b⋮3=3a+12b⋮3

→(5a+8b)+2(−a+2b)⋮3→(5a+8b)+2(-a+2b)⋮3

mà 5a+8b⋮35a+8b⋮3

→2(−a+2b)⋮3→2(-a+2b)⋮3

mà (2,3)=1(2,3)=1

→−a+2b⋮3→-a+2b⋮3

b)b) - Xét tổng :

(5a+8b)+(10a+b)(5a+8b)+(10a+b)

=5a+8b+10a+b=5a+8b+10a+b

=15a+9b⋮3=15a+9b⋮3

→(5a+8b)+(10a+b)⋮3→(5a+8b)+(10a+b)⋮3

mà 5a+8b⋮35a+8b⋮3

→10a+b⋮3→10a+b⋮3

c)c) - Xét tổng :

(5a+8b)+(16b+a)(5a+8b)+(16b+a)

=5a+8b+16b+a=5a+8b+16b+a

=6a+24b⋮3=6a+24b⋮3

→(5a+8b)+(16b+a)⋮3→(5a+8b)+(16b+a)⋮3

mà 5a+8b⋮35a+8b⋮3

→16b+a⋮3→16b+a⋮3

6)6)

- Xét x<0x<0

2017x=2016x+x2017x=2016x+x

mà x<0x<0

⇒2016x+x<2016x⇒2016x+x<2016x

⇒2017x<2016x⇒2017x<2016x

- Xét x=0x=0

⇒2016x=2017x=0⇒2016x=2017x=0

hay 2016x=2017x2016x=2017x

- Xét x>0x>0

2017x=2016x+x2017x=2016x+x

mà x>0x>0

⇒2016x+x>2016x⇒2016x+x>2016x

⇒2017x>2016x⇒2017x>2016x

b)b)

- Xét x<0x<0

x2>0x2>0

5x<05x<0

⇒x2>0>5x⇒x2>0>5x

⇒x2>5x⇒x2>5x

- Xét x=0x=0

⇒x2=5x=0⇒x2=5x=0

hay x2=5xx2=5x

- Xét x>0x>0

x2=x.x<5x⇔x<5x2=x.x<5x⇔x<5

x2=x.x=5x⇔x=5x2=x.x=5x⇔x=5

x2=x.x>5x⇔x>5

111111111+4253=?

Đáp án:

( ab + ba ) chia hết cho 11

Giải thích các bước giải:

Ta có: ( ab + ba )

= ( 10a + b) + ( 10b + a)

= 11a + 11b

Vì 11a và 11b đều chia hết cho 11

Suy ra: ( ab + ba )chia hết cho 11

sđt trong phần trang cá nhân nhé

là 1 nha 

~ ht ~

TR

1 nha

HT

nhớ k

nhớ kb

là 1 nha

~ ht ~

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TÌM DẤU CHẤM RỒI TRẢ LỜI CHO!!!!

A. Put the words in the correct order to make correct sentences.

43. Our/ short/ has/ hair/ is/ brown/ teacher/ and/ long/.

\(\rightarrow\) Our teacher is short and has long brown hair.

44. wearing/ She/ blue T-shirt/ is/ jeans/ a/ and/.

\(\rightarrow\) She is waering blue T-shirts and jeans.

B. Make a question for each underlined part.

45. My brother is tall and slim.

\(\rightarrow\) How is your brother?

46. Sarah is smart and very kind.

\(\rightarrow\) How is Sarah?

47. Sammy is wearing a pink skirt and white shoes today.

\(\rightarrow\) What is Sammy wearing today?

C. Use the given words/phrases to make complete sentences.

48. It/ sunny/ so/ let’s/ go/ the mall/.

\(\rightarrow\)  It's sunny so let's go to the mall.

49. We/ have/ picnic/ the park/ Sunday morning/.

\(\rightarrow\) We will have a picnic in the park on Sunday morning.

50. Michael/ watch/ movie/ home/ tonight/?

\(\rightarrow\) Is Michael watching the movie at home tonight?