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a. \(\frac{3}{5}+x=\frac{5}{6}\)
=> \(x=\frac{5}{6}-\frac{3}{5}\)
=> \(x=\frac{7}{30}\)
b. \(\left(3\frac{1}{2}+2x\right).\frac{8}{3}=\frac{16}{3}\)
=> \(3\frac{1}{2}+2x=\frac{16}{3}:\frac{8}{3}=2\)
=> \(2x=2-3\frac{1}{2}=2-\frac{7}{2}=-\frac{3}{2}\)
=> \(x=-\frac{3}{2}:2\)
=> \(x=-\frac{3}{4}\)
\(A=\frac{1}{4}:\left(10,3-9,8\right)-\frac{3}{4}\)
\(A=\frac{1}{4}:\left(0,5\right)-\frac{3}{4}\)
\(A=\frac{1}{4}:\frac{1}{2}-\frac{3}{4}\)
\(A=\frac{1}{4}\cdot2-\frac{3}{4}=\frac{1}{2}-\frac{3}{4}=\frac{2}{4}-\frac{3}{4}=\frac{-1}{4}\)
Bài 1:
a, \(A=\frac{1}{4}:0,5-\frac{3}{4}\)
\(=\frac{1}{2}-\frac{3}{4}\)
\(=\frac{-1}{4}\)
b, \(B=\frac{6}{7}+\frac{5}{8}:5-\frac{3}{16}.\left(-2\right)^2\)
\(=\frac{6}{7}+\frac{1}{8}-\frac{3}{4}\)
\(=\frac{6}{7}+\frac{-5}{8}\)
\(=\frac{13}{56}\)
Hk tốt
1. Is that your room ? 1. Is this her flower garden ?
2. Is that her hat ? 2. Is this their house ?
3. Is that his bike ? 3. Is this his cat ?
4. Is that their dog ? 4. Is this your pen ?
5. Is that your car ? 5. Is this her pencil case ?
\(34\%:\frac{51}{16}-\frac{34}{9}:6,5-\left(0,4\right)^2\)
\(=\frac{34}{100}:\frac{51}{16}-\frac{34}{9}:\frac{65}{10}-0,16\)
\(=\frac{34\cdot16}{100\cdot51}-\frac{34\cdot10}{9\cdot65}-\frac{16}{100}\)
\(=\frac{2\cdot17\cdot4\cdot4}{4\cdot5\cdot5\cdot17\cdot3}-\frac{2\cdot17\cdot2\cdot5}{3\cdot3\cdot5\cdot13}-\frac{4}{25}\)
\(=\frac{8}{75}-\frac{34}{117}-\frac{4}{25}=\left(\frac{8}{75}-\frac{4}{25}\right)-\frac{34}{117}\)
\(=\left(\frac{8}{75}-\frac{12}{75}\right)-\frac{34}{117}=\frac{-4}{75}-\frac{34}{117}\)
\(34\%\div\frac{51}{16}-\frac{34}{9}\div\frac{6}{5}-\left(0,4\right)^2\)
\(=\frac{34}{100}\times\frac{16}{51}-\frac{34}{9}\times\frac{5}{6}-0,16\)
\(=\frac{17}{50}\times\frac{16}{51}-\frac{85}{27}-\frac{16}{100}\)
\(=\frac{8}{75}-\frac{85}{27}-\frac{4}{25}\)
\(=\frac{8}{75}-\frac{85}{27}-\frac{12}{75}\)
\(=\frac{-4}{75}-\frac{85}{27}\)
\(=\frac{-108}{2025}-\frac{6375}{2025}\)
\(=\frac{-6483}{2025}\)
b)\(\frac{2n+6}{n-2}=\frac{2n-4+10}{n-2}=2+\frac{10}{n-2}\)
\(\Rightarrow n-2\in U\left(10\right)=\left\{1;2;5;10\right\}\)
\(\Rightarrow n=\left\{3;4;7;12\right\}\)
ý a thì tớ ko biết ý b thì làm như sau
2[n-2]+4+6
2[n-2]+10
n-2/n-2
10/[n-2]
Ư[10]=[1,-1,2,-2,5,-5,10,-10]
vì n-2 thuộc Ư[10]=[3,1,4,0,7,-3,12,-8]
[3,1,4,0,7,-3,12,-8] đó là kết quả chúcbanjk học tốt
NHỚ NHA
Ta có: \(\frac{6n+3}{3n+6}=\frac{6n+12-9}{3n+6}=\frac{2\left(6n+3\right)-9}{3n+6}=2-\frac{9}{3n+6}\)
Để 6n+3 chia hết cho 3n+6. thì 9 chia hết cho 3n+6
=> 3n+6\(\in\)Ư(9)
=> 3n+6 \(\in\){1,3,9}
=> 3n = 3
=> n = 3:3
=> n = 1
(1x1/2)x(1x1/3)x(1x1/4)...(1x1/2007)
=1/2x1/3x1/4...1/2007
=1/(2x3x4...2007)
=???
1. You / Hoa / visit / our teachers? - Yes
=> Are you and Hoa going to visit our teachers ? Yes , we are
2. How long / your uncle / stay / Huế? - He / 2days.
=> How long is your uncle going to stay in Hue ? He is going to stay there for about 2 days
3. How / children / go /beach? - They / bu
=> " bu " ???????
4. Miss Hoa / teach / us / literature / next term? - Yes
=> Is Miss Hoa going to teach us literature next term ? Yes , she is
5. What / you / be ? - teacher / grow up.
=> What are you going to be when you grow up ? I am going to be a teacher when I grow up
1. Are you and Hoa going to visit our teachers? Yes, we are.
2. How long is your uncle going to stay in Hue? He is going to stay in Hue for 2 days.
3. How are children going to beach? They are going to beach by bus.
4. Is Miss Hoa going to teach us literature in next term? Yes, she is.
5. What are you going to be? I am going to a teacher when I grow up.