GIÚP EM BÀI 1,2,3,4, VỚI Ạ,4H CHIỀU PHẢI NỘP RÒI Ạ
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Những câu hỏi liên quan
HN
7 tháng 10 2021
Bài 1:
c) \(C=\dfrac{5}{\sqrt{7}+\sqrt{2}} - \sqrt{8-2\sqrt{7}} + \sqrt{2} \)
⇔ \(C=\dfrac{5}{\sqrt{7}+\sqrt{2}} - \sqrt{(\sqrt{7})^2 - 2\sqrt{7}+1} + \sqrt{2} \)
⇔ \(C=\dfrac{5}{\sqrt{7}+\sqrt{2}} - \sqrt{(\sqrt{7}-1)^2} + \sqrt{2} \)do
⇔ \(C=\dfrac{5}{\sqrt{7}+\sqrt{2}} - |\sqrt{7}-1| + \sqrt{2} \)
⇔ \(C=\dfrac{5}{\sqrt{7}+\sqrt{2}} - \sqrt{7}+1 + \sqrt{2} \) (do \(\sqrt{7} > 1 \))
⇔ \(C=\dfrac{5}{\sqrt{7}+\sqrt{2}} - (\sqrt{7} - \sqrt{2}) +1 \)
⇔ \(C=\dfrac{5-(\sqrt{7} - \sqrt{2})(\sqrt{7}+\sqrt{2})}{\sqrt{7}+\sqrt{2}} +1 \)
⇔ \(C=\dfrac{5-7+2}{\sqrt{7}+\sqrt{2}} +1 =\dfrac{0}{\sqrt{7}+\sqrt{2}} +1 \)
⇔ \(C = 0 + 1 = 1\)
Vậy \(C=1\)
HN
7 tháng 10 2021
Bài 3:
c) Ta có: \(M=\dfrac{Q}{P} \)
⇔ \(M=\dfrac{\dfrac{\sqrt{x}}{\sqrt{x}-2}}{\dfrac{\sqrt{x}+5}{\sqrt{x}-2} } \)
⇔ \(M=\dfrac{\sqrt{x}}{\sqrt{x}+5} \)
Mà: \(M<\dfrac{1}{2} \) ⇔ \(\dfrac{\sqrt{x}}{\sqrt{x}+5} <\dfrac{1}{2} \)
⇒ \(2\sqrt{x} < \sqrt{x}+5 \) (nhân 2 vế với \(2.(\sqrt{x} +5) >0\))
⇔ \(\sqrt{x}<5 \) ⇔ \(x<25\)
Kết hợp điều kiện ban đầu, ta đc:
Vậy khi \(0≤x<25\) và \(x≠4\) thì \(M=\dfrac{Q}{P} < \dfrac{1}{2} \)
7 tháng 10 2021
Bài 1:
a: \(A=\sqrt{18}-2\sqrt{50}+3\sqrt{8}\)
\(=3\sqrt{2}-10\sqrt{2}+6\sqrt{2}\)
\(=-\sqrt{2}\)
giúp em 3 bài này với ạ em đang cần gấp chiều em hc ròi ạ ai làm đc bài nào thì gửi luôn giúp em ạ
11 tháng 9 2023
Bài 5:
1. There are a few students taking part in the event
→ There aren't many students taking part in the event.
2. If he doesn't work hard, he will lose his job
→ Unless he works hard, he will lose his job.
3. Let's write about the three Rs ?
→ Why don't we write about the three Rs?
4. Learning about recyking is fun
→ It's fun to learn about recycling.
5. It's not good to throw old clothes away
→ You shouldn't throw old clothes away
Xếp từ thành câu
Bài 1
1. they / to / movies / do / how / go / the / often ?
→ How often do they go to the movies?
2. your eyes / swimming / should / when goggles / you / you / go / wear / to protect
→ When you go swimming, you should wear goggles to protect your eyes.
3. usually / his / swimming / with / friends / he / goes
→ He usually goes swimming with his friends.
4. go / do / weekend / on / always / fishing / parents / their ?
→ Do their parents always go fishing on the weekend?
5. camping / they / go / do / sometimes
→ Sometimes they go camping.
6. what / TV / you / do / on / sports / watch?
→ What sports do you watch on TV?
Bài 2
1. Our / important / an / sports and games / in play / lives / part
→ Sports and games play an important part in our lives.
2. players / how / match / there / in / many / are / football / a ?
→ How many players are there in a football match?
3. by / she / to keep / every day / tries / fit / jogging
→ She tries to keep fit by jogging every day.
4. yesterday / who / play / football / you / did / with ?
→ Who did you play football with yesterday?
5. sports / building / physical and strength / necessary / are / for
→ Sports are necessary for building physical strength.
6. to switch / before / go / don't / the TV / off / you / forget / to bed
→ Don't forget to switch off the TV before you go to bed.
7. Sunday / I / usually / friends / swimming / on / go / mornings / with / my
→ On Sunday mornings, I usually go swimming with my friends.
8. match / you / on / the / did / television / last night / watch / basketball / the ?
→ Did you watch the basketball match on television last night?
NN
0
PN
5
GẤP Ạ...
ảnh lỗi nhé