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h) Ta có: \(\left\{{}\begin{matrix}\left|x-7\right|=\left|7-x\right|\ge7-x\\\left|x+5\right|\ge x+5\end{matrix}\right.\)
\(\Rightarrow\left|7-x\right|+\left|x+5\right|\ge\left(7-x\right)+\left(x+5\right)\)
\(\Rightarrow\left|x-7\right|+\left|x+5\right|\ge12\)
\(\Rightarrow H\ge12\)
Dấu "=" xảy ra \(\Leftrightarrow\left\{{}\begin{matrix}7-x\ge0\\x+5\ge0\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}x\le7\\x\ge-5\end{matrix}\right.\)
\(\Leftrightarrow-5\le x\le7\)
Vậy, MinH = 12 \(\Leftrightarrow-5\le x\le7\)
a) Ta có: \(A=2x^2-8x+10\)
\(=2\left(x^2-4x+5\right)\)
\(=2\left(x^2-4x+2^2+1\right)\)
\(2\left[\left(x-2\right)^2+1\right]\)
Ta lại có: \(\left(x-2\right)^2\ge0\)
\(\Rightarrow2\left[\left(x-2\right)^2+1\right]\ge2\)
\(\Rightarrow A\ge2\)
Dấu bằng xảy ra \(\Leftrightarrow\left(x-2\right)^2=0\)
\(\Leftrightarrow x-2=0\)
\(\Leftrightarrow x=2\)
Vậy MinA = 2 \(\Leftrightarrow x=2\)
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Bạn nào cho mk 1 ik, mk cho bn ý 3 ik luôn. Mk hứa nếu nói dối bạn có thể Báo cáo sai phạm mk.
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X. Complete the sentences with the past simple or past continuous form of the verbs in brackets.
11. He _was walking_(walk) down the road when he ____heard____(hear) a loud noise.
12. When we _were___(be) in Canana, we _went__(go) skiing almost every day.
13. Where _did__ you __go_(go) last summer holiday, Jim? ~ Well, I _took__(take) a trip to Minneapolis.
14. When I __arrived___(arrive), they ____said____(say) hello but continued working.
15. When you _______met__(meet) me yesterday, I __didn't go___(not go) to school, I ___went__(go) to the doctor’s - I felt terrible.
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1. How much does this dictionary cost ?
2. Where did she buy it ?
3.Where is the bank ?
4. When did you saw her ?
5. Who bought a poster ?
6. Where was your father last month ?
7. what's your favorite subject ?
8. what do you do in your free time?
9. what is your mother doing at the moment ?
10 . how often do you go to the cinema ?
11. when do they go to the beach ?
12. what did they see at the zoo ?
13. why does the teacher angry ?
14. How many kilos of oranges did you buy?
15. Where does Nga's father work?
16. What does his mother do every day ?
Mik mất công làm cho bn mong bạn đừng seen xem chùa ạ