tìm y
15+3>y-6>39-19
K
Khách
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2 tháng 4 2020
\((x-6)(3x-9)>0\)
TH1:
\(\orbr{\begin{cases}x-6< 0\\3x-9< 0\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x< 6\\x< 3\end{cases}}\)\(\Rightarrow x< 3\)
TH2:
\(\orbr{\begin{cases}x-6>0\\3x-9>0\end{cases}}\)\(\Rightarrow\orbr{\begin{cases}x>6\\x>3\end{cases}}\)\(\Rightarrow x>6\)
Vậy \(x< 3\) hoặc \(x>6\)thì \((x-6)(3x-9)>0\)
Học tốt!
2 tháng 4 2020
20.
\((2x-1)(6-x)>0\)
TH1:
\(\orbr{\begin{cases}2x-1>0\\6-x>0\end{cases}\Rightarrow\orbr{\begin{cases}x< \frac{1}{2}\\x< 6\end{cases}}\Rightarrow x< 6}\)
TH2
\(\orbr{\begin{cases}2x-1< 0\\6-x< 0\end{cases}\Rightarrow\orbr{\begin{cases}x>\frac{1}{2}\\x>6\end{cases}}\Rightarrow x>\frac{1}{2}}\)
Vậy \(x< 6\)hoặc \(x>\frac{1}{2}\)thì \((2x-1)(6-x)>0\)
NT
3
18 tháng 5 2020
a)30 > y-16 > 19+9
Vậy 30 > y-16 > 28
Số vừa nhỏ hơn 30, vừa lớn hơn 28 là số 29
Suy ra: y-16= 29
y = 29+16
y = 45
Vậy y = 45
b)24+y-9= 45
24+y = 45+9
24+y = 54
y = 54-24
y =30
Vậy y= 30
K
18 tháng 8 2018
Report Statements: Future Simple. Chage the direct speech into reported speech:
1.'' I'll go to the cinema later" =>she said she would go to the cinema later
2.'' We'll meet the children at 6" => she said they would meet the children at 6
3. ''She'll be late'' =>she said she would be late
4.'' lucy will definitely come'' => she said Lucy would definitely come
5. '' I will stop smoking on Tuesday'' =>she told us she would stop smoking on Tuesday
6. " John won't do it" => she said John wouldn't do it
7."They won't be able to arriver early'' =>she said they wouldn't be able to arrive early
8. "I won't come with you" => she said she wouldn't come with me
9." He won't remember to buy milk" => she said he wouldn't remember to buy milk
10. "It won't rain later I'm sure" => she said it wouldn't rain later she was sure
11. "The Conservatives will win the next electrion" => she said the Conservatives would win the next election
12. " that girl will never pass the exam" => she told us that girl would never pass the exam
13. " John will arrive before David" => she said John would arrive before David
14. " It will be cold tonight" => she said it would be cold tonight
15. " Mai will cook dinner'' => she said Mai would cook dinner
16. " We want to get married next year" => she said they wanted to get married next year
17. " I won't be able to afford a new car" => she said she wouldn't be able to afford a new car
18. " She won't want to attend the meeting" =>she said she wouldn't want to attend the meeting
19. "Richard won't drink coffee" => she said Richard wouldn't drink coffee
20. " I won't vote at the next election" => she said she wouldn't vote at the next election
8 tháng 8 2021
a 80-7 < y - 19 <63 +12 26 + 26 > 100 -y >93-59
52 > 100-y >34
y = 65,64,63,62,61,60,59,58,57,56,55,54,53,52,51,50,49,
73 < y -19< 75
y =95
\(15+3>y-6>39-19\)
\(< =>18>y-6>20\)
suy ra \(y-6=19< =>y=19+6=25\)
\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\)