\(\frac{x-2}{x+4}\le0\)
giúp mik nha Minh Anh mik làm rồi nhưng muốn kiểm tra
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3 tháng 4 2017
a) \(\frac{x}{3}\)\(-\)\(\frac{1}{8}\)\(=\)\(\frac{5}{8}\)
\(\Rightarrow\) \(\frac{x}{3}\)=\(\frac{5}{8}+\frac{1}{8}\)
\(\Rightarrow\) \(\frac{x}{3}\)\(=\frac{3}{4}\)
\(\Rightarrow\) x=3.3:4
\(\Rightarrow\) x=2,25
Vậy x=2,25
b) \(3\frac{1}{3}\).x-\(6\frac{3}{4}=3\frac{1}{4}\)
\(\Rightarrow\)\(\frac{10}{3}\).x-\(\frac{27}{4}=\frac{13}{4}\)
\(\Rightarrow\) \(\frac{10}{3}\).x=\(\frac{13}{4}+\frac{27}{4}\)
\(\Rightarrow\) \(\frac{10}{3}\).x=10
\(\Rightarrow\) x=\(10\div\frac{10}{3}\)
\(\Rightarrow\) x=3
Vậy x=3
Ủng hộ mik nha mọi người !
3 tháng 4 2017
Ta có : \(\frac{x}{3}-\frac{1}{8}=\frac{5}{8}\)
\(\Leftrightarrow\frac{x}{3}=\frac{5}{8}-\frac{1}{8}\)
\(\Leftrightarrow\frac{x}{3}=\frac{1}{2}\)
\(\Leftrightarrow x=\frac{1}{2}.\frac{1}{3}=\frac{1}{6}\)
29 tháng 3 2019
B=x-2/x+3
Để phân số sau là 1 số nguyên
=>x-2 chia hết cho x+3
=>x-2-(x+3) chia hết cho x+3
=>x-2-x-3 chia hết cho x+3
=>-5 chia hết cho x+3
=>x+3 thuộc Ư(-5)={1,-1,5,-5 }
=>x thuộc {-2,-4,2,-8}
............chúc bạn học tốt ..........
VD
4
23 tháng 11 2017
A Place I know well
From the moment I arrive at Orlando Florida’s International Airport I am thrilled to be back to my favorite place in the world. A thirty-minute drive away is a place called the International Drive; this is where I stay during my time in Florida. Orlando's 14.5 mile long International Drive is a place I know only to well. Having been fortunate enough to stay on the International Drive several times I am aware of all of the great things it has to offer. It is a place that makes me feel such happiness whenever I visit, a place that holds fond memories and a place I will continue to visit for as long as I possibly can.
The International Drive is always busy. The majority of people are tourists staying in the area. Many people uses this areas to stay as it is in the heart of Orlando and is ideally situated close to Walt Disney World Resorts and other theme parks such as Sea World and Busch Gardens. There is never a dull moment on the I-Drive. From the moment you leave the hotel you are surrounded by a great deal of things to see and do. Amongst these things are a fantas water park, arcades, numerous adventure golf courses, museums, restaurants, dinner shows and so much more. There are plenty of attractions to keep you busy plus, at each end of the road, some great outlets for shopping. The majority of the things to do are within walking distance but alternatively tourists can take advantage of the I-ride Trolleys. These are very cheap little green buses that have marked stops dotted along the drive and they are never far away from wherever it is you want to go.
During my holiday there is one place I never fail to return to. The Outta Control Magic Comedy Dinner Show is spectacular and never fails to amaze me. I have seen this show a countless number of times and it's still funny. Over the years new tricks and acts have been added but even the same ones continue to be amusing. The combination of high-energy comedy, spectacular magic and audience paripation makes it a great place to visit for the entire family.
During my stay on the International Drive family and myself enjoy staying at a hotel called quality inns and suites. This hotel holds special memories for me as it was somewhere I had stayed with my late farther. The hotel itself has three swimming pools and a hot tub. Adjacent to the main pool the hotel bar was situated. I fondly remember many nights spent here doing karaoke and playing pool. Every morning we would head downstairs to the hotels restaurant and fill ourselves up on the array of breakfast that the buffet had to offer. We would then queue up outside where the hotels shuttle bus would transport us to Walt Disney World Resort.
The International Drive area lives up to its name as a truly ‘international’ culinary destination. All of my favorite eateries can be found here and is not to be missed by anybody wishing to experience the mulultural cuisine the area has to offer. There is one parular place worthy of special mention. My personal favorite restaurant is a Japanese steak house called ‘Showguns’. The steak is of the highest standard as I am yet to experience anything it back home in the United Kingdom. The décor of the restaurant is truly beautiful as is the experience of having the chef prepare and cook my meal on my table. Eating in such a fine place surrounded by my family and friends is priceless.
There are so many reasons why I love this place so much. It is a place that holds fond memories of times spent with my closet friends and family. Its vibrant location and buzzing atmosphere never fails to excite me. This is a place that I will continue to visit and look forward to many more holidays in time with my children so they too can look back and smile when they think about this truly wonderful place. Until then I shall be saving for my next holiday!
AT
23 tháng 11 2017
Hello everybody, my name is Học, I am a student who come from Bình Định. It has been a year since I came here to study at Nha Trang College of Tourism and Art Culture. It isn’t a long time to discover all things here but it’s enough time for me to say that I’ve made a good decision to come here for my brighter future.. The most beautiful city in Vietnam? This is a difficult question, as each place has it's charm. I think Nha Trang is the most interesting city.
A
13 tháng 4 2017
=10/17+-5/13+7/17+-8/13+-11/25
=1+-1+-11/25
=11/25
b ,
= 1+-2+3+-4+5+-6+......2011+-2012
=1+1+1+1+1.........+-2012
=1.2011+-2012
=2011+-2012
=-1
2.
2/3-x = 5/4
=>x=2/3-5/4
=>x=-7/12
b,
[124-(20-4x)]:30+7=11
=>124-(20-4x)] :30 =11-7
=>[124-(20-4x)]:30=4
=>124-(20-4x)=4x30
=>124-(20-4x)=120
=>20-4x=120-124
=>20-4x=4
=>4x=20-4
=>4x=16
=>x=16:4
=>x=4
13 tháng 4 2017
bài 1
a, ghép cặp phân số 10/17 + 7/17 và 5/13 + -8/13
b, 1-2+3-4+5-6+.....+2011-2012
= ( 1-2) + ( 3-4) + ( 5-6) +....+(2011-2012)
= (-1) + (-1) + (-1) + ....+ (-1)
< từ 1 đến 2012 có 2012 số số hạng, suy ra có 1006 cặp mà mỗi cặp có giá trị = (-1) Suy ra tổng trên = (-1) * 1006=-1006
4 tháng 4 2017
\(\left(3\frac{1}{2}+2x\right).2\frac{2}{3}=5\frac{1}{3}\)
<=>\(\left(\frac{7}{2}+2x\right).\frac{8}{3}=\frac{16}{3}\)
<=>\(\frac{28}{3}+\frac{16x}{3}=\frac{16}{3}\)
<=>\(\frac{16x}{3}=\frac{-2}{3}\)
<=>\(16x=-2\)
<=>\(x=\frac{-1}{8}\)
vậy \(x=\frac{-1}{8}\)
b,\(\left|2x+3\right|=5\)
xét x<0,ta co: \(\left|2x+3\right|=5\)<=> \(-2x+3=5\)<=>\(-2x=2\)<=>\(x=-1\)(loại)
xét x>0,ta co:\(\left|2x+3\right|=5\)<=>\(2x+3=5\)<=>\(2x=2\)<=>\(x=1\)
c,\(\frac{x-2}{4}=\frac{5+x}{3}\)
<=>\(\frac{3x-6}{12}=\frac{20+4x}{12}\)
=>\(3x-6=20+4x\)
<=>\(3x-6-20-4x=0\)
<=>\(-x-26=0\)
<=>\(-x=26\)
<=>\(x=-26\)
kl:.......
H
16 tháng 3 2023
\(\dfrac{x-1}{x}-\dfrac{1}{x+1}=\dfrac{2x-1}{x^2+x}\)
\(\Leftrightarrow\dfrac{x-1}{x}-\dfrac{1}{x+1}=\dfrac{2x-1}{x\left(x+1\right)}\)
ĐKXĐ : \(\left\{{}\begin{matrix}x\ne0\\x+1\ne0\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x\ne0\\x\ne-1\end{matrix}\right.\)
Ta có : `(x-1)/x -1/(x+1) =(2x-1)/(x(x+1))`
\(\Leftrightarrow\dfrac{\left(x-1\right)\left(x+1\right)}{x\left(x+1\right)}-\dfrac{x}{x\left(x+1\right)}=\dfrac{2x-1}{x\left(x+1\right)}\)
`=> x^2 +x -x-1 -x-2x+1=0`
`<=> x^2 -3x =0`
`<=> x(x-3)=0`
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x-3=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\left(ktm\right)\\x=3\end{matrix}\right.\)
__
`(x+2)(5-3x)=0`
\(\Leftrightarrow\left[{}\begin{matrix}x+2=0\\5-3x=0\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-2\\3x=5\end{matrix}\right.\)
\(\Leftrightarrow\left[{}\begin{matrix}x=-2\\x=\dfrac{5}{3}\end{matrix}\right.\)
__
\(\dfrac{5\left(1-2x\right)}{3}+\dfrac{x}{2}=\dfrac{3\left(x-5\right)}{4}-2\)
\(\Leftrightarrow\dfrac{20\left(1-2x\right)}{12}+\dfrac{6x}{12}=\dfrac{9\left(x-5\right)}{12}-\dfrac{24}{12}\)
`<=> 2x- 40x + 6x = 9x - 45 -24`
`<=> 2x- 40x + 6x-9x + 45 +24=0`
`<=>-41x+69=0`
`<=>-41x=-69`
`<=> x=69/41`
HN
2 tháng 7 2018
Có \(\overline{abcde7}.5=\overline{7abcde}\)
\(\Rightarrow\left(10.\overline{abcde}+7\right).5=700000+\overline{abcde}\)
\(\Rightarrow50.\overline{abcde}.35=700000+\overline{abcde}\)
\(\Rightarrow49.\overline{abcde}=700000-35=699965\)
\(\Rightarrow\overline{abcde}=699965:49=14285\)
Vậy \(\overline{abcde}=14285\)
F
2 tháng 7 2018
Tìm số tự nhiên abcde biết abcde7 x 5 = 7abcde
Bài giải
Ta có : abcde7 x 5 = 7abcde
Mà abcde7 có chữ số tận cùng là 7 nên khi nhân với 5 số đó sẽ có kết quả tận cùng bừng chữ số 5. Vậy kết quả 7abcde sẽ có chữ số cuổi cùng bằng 5 . Vậy bây giờ ta có biểu thức :
abcd57 x 5 = 7abcd5
Ta làm phép tính từ trái qua phải :
5 nhân 7 bằng 35 viết 5 nhớ 3 , 5 nhân 5 bằng 25 thêm 3 bằng 28 viết 8 nhớ 2
Tương tự như trên vậy bây giờ ta lại có biểu thức :
abc857 x 5 = 7abc85
Vậy như trên ta có : 5 nhân 5 bằng 25 thêm 3 bằng 28 viết 8 nhớ 2 , 5 nhân 8 bằng 40 thêm 2 bằng 42 viết 2
ab2857 x 5 = 7ab285
Vậy như trên ta có : 5 nhân 8 bằng 40 thêm 2 bằng 42 viết 2 nhớ 4 , 5 nhân 2 bằng 10 thêm 4 bằng 14 viết 4 nhớ 1
a42857 x 5 = 7a4285
Vậy như trên ta lại có : 5 nhân 2 bằng 10 thêm 4 bằng 14 viết 4 nhớ 1 , 5 nhân 4 bằng 20 thêm 2 bằng 22 viết 22
Vậy abcde = 2242587
Chúc bạn học tốt !
6 tháng 8 2016
Ta có : n và n + 1 là hai số tự nhiên liên tiếp
Mà hai số tự nhiên liên tiếp có ƯCLN = 1
=> Không thể rút gọn được.
=> Là phân số tối giản.
Vậy : \(\frac{n}{n+1}\) là phân số tối giản
10 tháng 10 2016
VI
56. B
57.A
58. B
59. A
60. C ( Mình hk chắc lắm)
61. C
62. A ( Mình hk chắc)
63. B
64. C
65. C
VIII:
71,72,74: True
73,75: False
TH1 : \(\frac{x-2}{x+4}=0\Rightarrow x-2=0\Rightarrow x=2\)
TH2 :\(\frac{x-2}{x+4}< 0\)=> x - 2 và x + 4 trái dấu mà x - 2 < x + 4 ; số âm nhỏ hơn số dương
=> x - 2 < 0 ; x + 4 > 0 => x < 2 ; x > -4 => -4 < x < 2 mà trong trường hợp này bao gồm cả x = 0
Vậy -4 < x < 2
Cho mình hỏi có điều kiện x nguyên ko ?