a) |x+5|+3=7
b)25-|x|=10
Can you help me?Fast nhé
Thank you very much
a) |x+5|+3=7
b) 25-|x|=10
Can you help me?Fast
Spam bạn ơi
Mấy câu này dễ mà
a)x thuộc -9;-1
b)x thuộc -15;15
=>bạn phá trị r giải 2 trường hợp
a) |x+5| + 3 = 7
--> |x+5| = 7-3
--> |x+5| = 4
--> x+5=4 hoặc x+5= -4
+ Nếu: x+5=4 + Nếu: x+5= -4
--> x= 4-5 --> x= -4-5
--> x= -1 --> x= -9
Vậy x= -1 hoặc x= -9.
b) 25-|x| = 10
--> |x| = 25-10
--> |x| = 15
--> x=15 hoặc x= -15
Vậy x=15 hoặc x= -15
Chúc bạn học tốt!
x^2-2x+2-√(x+7)+√(x-1)=0 giải phuong trinh. Please help me. thank you very much
3 x x +x + x +x x4=1998
Help me!
3 bạn đầu tiên/3 tick
5 bạn thứ hai/2tick
Các bạn chép đầy đủ giúp mình nhé!!
Thank you very much!
tìm x
a 5×4^x=80
b 15-|x|=25
c x^2-[6^2-(8^2-9×7)^3-7×5]^3-5×3=1^3
d (x-7)^3=2^5×5^2+2×10^2
giúp mình nha tick 5 nè thank you very much
💚💚
a, 5 . 4x = 80
4x = 80 : 5
4x = 16
4x = 42
Vậy x = 2
b. 15 - |x| = 25
|x| = 15 - 25
|x| = -10
=> x rỗng vì giá trị tuyệt đối của một số phải là số nguyên dương
c. x2 - [62 - (82 - 9 . 7)3 - 7 . 5]3 - 5 . 3 = 13
x2 - [36 - (64 - 63)3 - 35]3 - 15 = 1
x2 - [36 - 13 - 35]3 - 15 = 1
x2 - [36 - 1 - 35]3 - 15 = 1
x2 - 03 - 15 = 1
x2 - 0 - 15 = 1
x2 - 0 = 1 + 15
x2 - 0 = 16
x2 = 16 + 0
x2 = 16
x2 = 42
Vậy x = 4
d. (x - 7)3 = 25 . 52 + 2 . 102
(x - 7)3 = 32 . 25 + 2 . 100
(x - 7)3 = 800 + 200
(x - 7)3 = 1000
(x - 7)3 = 103
x - 7 = 10
x = 10 + 7
x = 17
Vậy x = 17
b 15-|x|=25
|x|=15-25
|x|=-10
Suy ra x=-10 hoặc x=10
x^2-[6^2-(8^2-9.7)^3-7.5]^3-5.3=1^3
x^2[36-(64-63)^3-7.5]^3-5.3=1
x^2[36-1^3-7.5]^3-5.3=1
x^2[36-1-35]^3-5.3=1
x^2[35-35]^3-5.3=1
x^2.0^3-5.3=1
x^2.0-15=1
x^2.0=1+15
x^2.0=16
x^2=16:0
x^2=16
=>x=4
1...................How can I help you ?
a. Do you need any help ?
b, How may I help you
c. Let me help you
d. could you help me
2. Let me help you ?-.....................
a, no problem
b. no. thank you
c. thank you, I don't need
d. sure
3. I need a favor.-...................
a. no problem
b. what do you need
c. Yes. I know
d. No thank you
4. .............?- Certainly
a. do you help me ?
b. you don't mind helping me
c. can you help me
d. that's very kind of you
5. .................?- Yes. That's very kind of you
a. may I help you
b. Did you need any help
6. The red bicycle is not as expensive ...............the blue one
a. so
b. like
c. more
d. as
7. They're offering a 10%...........on all sofas this month
a. reward
b. discount
c. reduce
d. cut
8. Mr Brown is the same age............my father
a, as
b. like
c. from
d. with
9. Could you do me a favor, please ?
a, I can't help you
b, Sure. What can I do for you
c. Yes. Thank you
d. Luckily, I am really busy
10. Excuse me! I'm doing my homework,................turn down your radio a bit ?
a, would you like
b. why don't you
c. could you
d. would you mind
11. would you like to see a film?
a, yes I like
b. yes I do
c. Yes I will
d. Great!Let's go
1...................How can I help you ?
a. Do you need any help ?
b, How may I help you
c. Let me help you
d. could you help me
2. Let me help you ?-.....................
a, no problem
b. no. thank you
c. thank you, I don't need
d. sure
3. I need a favor.-...................
a. no problem
b. what do you need
c. Yes. I know
d. No thank you
4. .............?- Certainly
a. do you help me ?
b. you don't mind helping me
c. can you help me
d. that's very kind of you
5. .................?- Yes. That's very kind of you
a. may I help you
b. Did you need any help
6. The red bicycle is not as expensive ...............the blue one
a. so
b. like
c. more
d. as
7. They're offering a 10%...........on all sofas this month
a. reward
b. discount
c. reduce
d. cut
8. Mr Brown is the same age............my father
a, as
b. like
c. from
d. with
9. Could you do me a favor, please ?
a, I can't help you
b, Sure. What can I do for you
c. Yes. Thank you
d. Luckily, I am really busy
10. Excuse me! I'm doing my homework,................turn down your radio a bit ?
a, would you like
b. why don't you
c. could you
d. would you mind
11. would you like to see a film?
a, yes I like
b. yes I do
c. Yes I will
d. Great!Let's go
1.d
2.c
3.b
4.c
5.a
6.d
7.b
8.a
9.b
10.c
11.d
Can you help me... Thank you so much
\(\dfrac{x^2-3xy+y^2}{x+y+2}\)
với x= 3+\(\sqrt{5}\) y= 3-\(\sqrt{5}\)
HELP ME AND THANK YOU VERY MUCH
\(\dfrac{x^2-3xy+y^2}{x+y+2}=\dfrac{\left(3+\sqrt{5}\right)^2+3\left(3+\sqrt{5}\right)\left(3-\sqrt{5}\right)+\left(3-\sqrt{5}\right)^2}{3+\sqrt{5}+3-\sqrt{5}+2}=\dfrac{9+2\cdot3\sqrt{5}+5+3\left(9-5\right)+9-2\cdot3\cdot\sqrt{5}+5}{8}=\dfrac{40}{8}=5\)
6/11*x = 9/2*y = 15/5*z và y-x+z = (-120)
MN giải nhanh giùm mik nhé ( đừng làm tắt nhé )
Help me please !
Thank you very much !
Ta có : \(\frac{6}{11}x=\frac{9}{2}y\)=> \(\frac{12x}{22}=\frac{99y}{22}\)=> 12x = 99y => 4x = 33y => \(\frac{x}{33}=\frac{y}{4}\)
\(\frac{9}{2}y=\frac{15}{5}z\)=> \(\frac{45y}{10}=\frac{30z}{10}\)=> 45y = 30z => 3y = 2z => \(\frac{y}{2}=\frac{z}{3}\)
=> \(\frac{x}{33}=\frac{y}{4};\frac{y}{2}=\frac{z}{3}\)
=> \(\frac{x}{66}=\frac{y}{4};\frac{y}{4}=\frac{z}{12}\)
=> \(\frac{x}{66}=\frac{y}{4}=\frac{z}{12}\)và y - x + z = -120
Áp dụng t/c dãy tỉ số bằng nhau ta có :
\(\frac{x}{66}=\frac{y}{4}=\frac{z}{12}=\frac{y-x+z}{4-66+12}=\frac{-120}{-50}=\frac{12}{5}\)
=> \(\hept{\begin{cases}\frac{x}{66}=\frac{12}{5}\\\frac{y}{4}=\frac{12}{5}\\\frac{z}{12}=\frac{12}{5}\end{cases}}\)=> \(\hept{\begin{cases}x=\frac{792}{5}\\y=\frac{48}{5}\\z=\frac{144}{5}\end{cases}}\)
Hãy sắp xếp những câu sau thành hai bài hội thoại hợp lí:
No problem. i'll help you.
Could you do me a favor, please?
Thank you. i'm sure i'll find it.
Do you need my help?Thank you very much. That's very kind of you.
Certainly. Go ahead. Take the second turning on the left. It's on the way.
Sure. What can i do for you?
Yes. Could you show me to the nearest bus-stop?
Can you help me remove this motorbike? It's on the way.
Hãy sắp xếp những câu sau thành hai bài hội thoại hợp lí:
P1
(1)Could you do me a favor, please?
(2)Sure. What can i do for you?
(3)Yes. Could you show me to the nearest bus-stop?
(4)Certainly. Go ahead. Take the second turning on the left. It's on the way.
(5)Thank you. i'm sure i'll find it.
P2
(1)Do you need my help?
(2)Can you help me remove this motorbike? It's on the way.
(3)No problem. i'll help you.
(4)Thank you very much. That's very kind of you.