Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
a) Áp dụng BĐT AM-GM ta có:
\(x+y\ge2\sqrt{xy}\)
\(\Rightarrow\)\(\frac{x+y}{2}\ge\sqrt{xy}\)
Dấu "=" xảy ra \(\Leftrightarrow\)\(x=y\)
b) Áp dụng BĐT AM-GM ta có:
\(\frac{\sqrt{x}}{\sqrt{y}}+\frac{\sqrt{y}}{\sqrt{x}}\ge2\sqrt{\frac{\sqrt{x}}{\sqrt{y}}.\frac{\sqrt{y}}{\sqrt{x}}}=2\)
Dấu "=" xảy ra \(\Leftrightarrow\)\(x=y\)
D C D B C C C D A
Sam puts up the decorations.
Five guests came to the party.
Molly and Sam play video games with their cousins
The family was celebrating too early. Dad's birthday was two months away.
relationship
celebration
married
golden
quietly
celebratory
refer
1. he dislike being called " the liar " => He dislike people..CALLING HIM THE LIAR.
2. The police are following the suspects => The suspects ..ARE BEING FOLLOWED BY THE POLICE.
3. She always expects to be admired by everybody => She always expects everybody..TO ADMIRE HER...
4. Someone stole his car two days ago => He had ..HIS CAR STOLEN BY SOMEONE TWO DAYS AGO..
\(\dfrac{9^{15}.8^{11}}{3^{29}.16^8}=\dfrac{\left(3^2\right)^{15}.\left(2^3\right)^{11}}{3^{29}.\left(2^4\right)^8}=\dfrac{3^{30}.2^{33}}{3^{29}.2^{32}}\)
Ta lấy vễ trên chia vế dưới
\(=3.2=6\)
\(\dfrac{2^{11}.9^3}{3^5.16^2}=\dfrac{2^{11}.\left(3^2\right)^3}{3^5.\left(2^4\right)^2}=\dfrac{2^{11}.3^6}{3^5.2^8}\)
Ta lấy vế trên chia vế dưới
\(=2^3.3=24\)
\(\dfrac{9^{15}.8^{11}}{3^{29}.16^8}=\dfrac{\left(3^2\right)^{15}.\left(2^3\right)^{11}}{3^{29}.\left(2^4\right)^8}=\dfrac{3^{30}.2^{33}}{3^{29}.3^{32}}=3.2=6\)
\(\dfrac{2^{11}.9^3}{3^5.16^2}=\dfrac{2^{11}.\left(3^2\right)^3}{3^5.\left(2^4\right)^2}=\dfrac{2^{11}.3^6}{3^5.2^8}=2^3.3=8.3=24\)
1 Jill reminded John to do the washing up
2 The police ordered his men to search all the shops on that street
3 She blamed me for ignoring the notice about life-saving equipment
4 My aunt advised me not to argut with my father
5 Stella congratulated Jeff on having got an promotion at last
6 Kevin apoligized to Sarah for making her angry
7 The man warn his son to put down the gun
8 Ron denied being in the town on the night of the robbery
9 Ted promise to pay back the money at the end of that month
10 George encouraged Susan to send her story to the magazine
11 Natalie accused Tom of lying to her
31 enthusiastic
32 experienced
33 celebrities
34 embarrassment
35 suspiciously
36. By the time Tom arrived at the party, most of the guests had left.
37. Sue is made to wash her hands before meals by her parents (câu này đề sai vì cấu trúc chủ động của make là make sb + V, cấu trúc bị động là be made to V)
38. When we were having lunch, there was a knock at the door.
39. She can't get used to being criticized by people around.
40. The detective happened to discover the secret.
