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4 tháng 1 2017

=>24-/3k-6/=7-4

=>24-/3k-6/=3

=>/3k-6/=24-3

=>/3k-6/=21

=>3k-6=21;-21

th1:3k-6=21

k=9

th2:3k-6=-21

k=-5

1 tháng 3 2018

Hinh câu 1

3 tháng 2 2017

bài 1 là 3

3 tháng 2 2017

làm như thế nào vậy ạ

Câu 1 The function mm is defined on the real numbers by m(k) = \dfrac{k+2}{k+8}m(k)= k+8 k+2 ​ . What is the value of 10\times m(2)10×m(2)? Answer: Câu 2 The function ff is defined on the real numbers by f(x)= ax-3f(x)=ax−3. What is the value of a if f(3)=9f(3)=9? Answer: Câu 3 The function ff is defined on the real numbers by f(x)= 2x+a-3f(x)=2x+a−3. What is the value of a if f(-5)=11f(−5)=11? Answer: Câu 4 The function ff is defined on the real numbers by f(x) = 2 +...
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Câu 1 The function mm is defined on the real numbers by m(k) = \dfrac{k+2}{k+8}m(k)= k+8 k+2 ​ . What is the value of 10\times m(2)10×m(2)? Answer: Câu 2 The function ff is defined on the real numbers by f(x)= ax-3f(x)=ax−3. What is the value of a if f(3)=9f(3)=9? Answer: Câu 3 The function ff is defined on the real numbers by f(x)= 2x+a-3f(x)=2x+a−3. What is the value of a if f(-5)=11f(−5)=11? Answer: Câu 4 The function ff is defined on the real numbers by f(x) = 2 + x-x^2f(x)=2+x−x 2 . What is the value of f(-3)f(−3)? Answer: Câu 5 Given a real number aa and a function ff is defined on the real numbers by f(x)=-6\times|3x|-4f(x)=−6×∣3x∣−4. Compare: f(a)f(a) f(-a)f(−a) Câu 6 There are ordered pairs (x;y)(x;y) where xx and yy are integers such that \dfrac{5}{x}+\dfrac{y}{4}=\dfrac{1}{8} x 5 ​ + 4 y ​ = 8 1 ​ Câu 7 Given a negative number kk and a function ff is defined on the real numbers by f(x)=\dfrac{6}{13}xf(x)= 13 6 ​ x. Compare: f(k)f(k) f(-k)f(−k) Câu 8 Given a positive number kk and a function ff is defined on the real numbers by f(x)=\dfrac{-3}{4}x+4f(x)= 4 −3 ​ x+4. Compare: f(k)f(k) f(-k)f(−k). Câu 9 A=(1+2+3+\ldots+90) \times(12 \times34-6 \times 68):(\dfrac{1}{3}+\dfrac{1}{4}+\dfrac{1}{5}+\dfrac{1}{6})=A=(1+2+3+…+90)×(12×34−6×68):( 3 1 ​ + 4 1 ​ + 5 1 ​ + 6 1 ​ )= Câu 10 Given that \dfrac{2x+y+z+t}{x}=\dfrac{x+2y+z+t}{y}=\dfrac{x+y+2z+t}{z}=\dfrac{x+y+z+2t}{t} x 2x+y+z+t ​ = y x+2y+z+t ​ = z x+y+2z+t ​ = t x+y+z+2t ​ . The negative value of \dfrac{x+y}{z+t}+\dfrac{y+z}{t+x}+\dfrac{z+t}{x+y}+\dfrac{t+x}{y+z} z+t x+y ​ + t+x y+z ​ + x+y z+t ​ + y+z t+x ​ is

2
28 tháng 2 2018

nhanh đi nhé

1 tháng 11 2019

KHO QUÁ ĐI

4 tháng 5 2020

Mk ko hỉu

4 tháng 5 2020

Có thật là toán lớp 5 ko dzợ

11 tháng 7 2023

Theo bài ra ta có: k + 4  ⋮ 11

                      ⇒ k - (-4) ⋮ 11 

                      ⇒ k \(\equiv\) - 4 (mod 11)

                      ⇒ k2 \(\equiv\) (-4)2 (mod 11)

                          3k \(\equiv\) 3.(-4)(mod 11)

                          5 \(\equiv\) 5 (mod 11)

Cộng vế với vế ta có: k2 + 3k + 5 \(\equiv\) 16  - 12 + 5 (mod 11)

                        ⇒        k2 + 3k + 5 \(\equiv\) 9 (mod 11) 

Giả sử điều cần chứng minh là đúng thì 

                       k2 + 3k + 5 ⋮ 11 ⇔ 9  ⋮ 11 ( vô lý)

Nên điều giả sử là sai

Vậy với k \(\in\) Z chứng minh rằng k2 + 3k + 5 ⋮ 11 ⇔ k + 4 ⋮ 11 là điều không thể xảy ra.

 

        

 

  

11 tháng 7 2023

Bạn xem lại đề có đúng không theo tôi k-4⋮11

TEST 3 : WHAT'S THE ORDER ? Rearrange the letters or words in the right order. Question 1 : folwer garden / your house? / Is there / in front of / a - My full answer : .......................................................... Question 2 : and / two apples. / five oranger / like / We'd - My full answer : .......................................................... Question 3 : their son have / meals / does/ everyday? /How many - My full aswer :...
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TEST 3 : WHAT'S THE ORDER ?

Rearrange the letters or words in the right order.

Question 1 :

folwer garden / your house? / Is there / in front of / a

- My full answer : ..........................................................

Question 2 :

and / two apples. / five oranger / like / We'd

- My full answer : ..........................................................

Question 3 :

their son have / meals / does/ everyday? /How many

- My full aswer : .............................................................

Question 4 :

are lying / in bed / All/ now. / the children

- My full aswer : ............................................................

Question 5 :

are /Lisa's/ Mr and / parents./ Mrs Baker.

- My full aswer : .............................................................

Question 6 :

at / They are / a restaurant./ having/ dinner

- My full aswer : ..............................................................

Question 7 :

visit Da Nang/ She is/ for/ going to/ two weeks

- My full aswer : ..........................................................

Question 8 :

does / What / like? / Jane / kind of weather

- My full aswer : ...........................................................

Question 9 :

you have / bread / for breakfast ? / any / Do

- My full aswer : ............................................................

Question 10 :

travel / going to / She is / by car. / to HCM City

- My full aswer : ........................................................

đơn giản thôi phải ko

1
17 tháng 3 2017

Question 1 :

folwer garden / your house? / Is there / in front of / a

- My full answer : Is there a flower garden in front of your house ?

Question 2 :

and / two apples. / five oranger / like / We'd

- My full answer : We'd like five oranges and two apples.

Question 3 :

their son have / meals / does/ everyday? /How many

- My full aswer : How many meals does their son have everyday?

Question 4 :

are lying / in bed / All/ now. / the children

- My full aswer : All the children are lying in bed now.

Question 5 :

are /Lisa's/ Mr and / parents./ Mrs Baker.

- My full aswer : Mr and Mrs Baker are Lisa's parents.

Question 6 :

at / They are / a restaurant./ having/ dinner

- My full aswer : They are having dinner in a restaurant.

Question 7 :

visit Da Nang/ She is/ for/ going to/ two weeks

- My full aswer : She is hoing to visit Da Nang for two weeks.

Question 8 :

does / What / like? / Jane / kind of weather

- My full aswer : What kind of weather does Jane like ?

Question 9 :

you have / bread / for breakfast ? / any / Do

- My full aswer : Do you have bread for breakfast ?

Question 10 :

travel / going to / She is / by car. / to HCM City

- My full aswer : She is going to travel to HCM city by car.

2 tháng 11 2018

Thay mặt người đào tạo chương trình hôm nay : Có 200 suất học bỗng cho những học sinh tích cực hoạt động từ bây giờ ( Mỗi suất học bỗng là 100k). Nhận thưởng bằng cách vào google tìm kiếm.

Link như sau vào google hoặc cốc cốc để tìm kiếm:

https://lazi.vn/quiz/d/17912/game-lien-quan-mobile-ra-doi-vao-ngay-thang-nam-nao

Copy cũng được nha

Để hai đường thẳng này song song thì

\(\left\{{}\begin{matrix}2-k^2=k\\k-5< >3k-7\end{matrix}\right.\)

=>\(\left\{{}\begin{matrix}-k^2-k+2=0\\-2k\ne-2\end{matrix}\right.\)

=>\(\left\{{}\begin{matrix}k^2+k-2=0\\k\ne1\end{matrix}\right.\)

=>\(\left\{{}\begin{matrix}\left(k+2\right)\left(k-1\right)=0\\k\ne1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}k\in\left\{-2;1\right\}\\k\ne1\end{matrix}\right.\)

=>k=-2

8 tháng 12 2023

ĐKXĐ: \(\left\{{}\begin{matrix}2-k^2\ne0\\k\ne0\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}k\ne0\\k\ne\sqrt{2}\\k\ne-\sqrt{2}\end{matrix}\right.\)

Để hai đường thẳng đã cho song song thì:

\(\left\{{}\begin{matrix}2-k^2=k\\k-5\ne3k-7\end{matrix}\right.\)

*) \(2-k^2=k\)

\(\Leftrightarrow k^2+k-2=0\)

\(\Leftrightarrow k^2-k+2k-2=0\)

\(\Leftrightarrow\left(k^2-k\right)+\left(2k-2\right)=0\)

\(\Leftrightarrow k\left(k-1\right)+2\left(k-1\right)=0\)

\(\Leftrightarrow\left(k-1\right)\left(k+2\right)=0\)

\(\Leftrightarrow k-1=0;k+2=0\)

+) \(k-1=0\)

\(\Leftrightarrow k=1\) (nhận)    (1)

+) \(k+2=0\)

\(\Leftrightarrow k=-2\) (nhận)    (2)

*) \(k-5\ne3k-7\)

\(\Leftrightarrow k-3k\ne-7+5\)

\(\Leftrightarrow-2k\ne-2\)

\(\Leftrightarrow k\ne1\)    (3)

Từ (1), (2) và (3) \(\Rightarrow k=-2\) thì hai đường thẳng đã cho song song