1.easy class là gì ?
K
Khách
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AK
1
16 tháng 4 2020
cheeky :táo tợn
adventuruse :phiêu lưu
absent-minded :đãng trí
rude :thô lỗ
amusing : gây cười
easy-going : dễ dãi
selfish :ích kỉ
Học tốt
#Tan
TK
5
23 tháng 7 2020
phân số thập phân có thể rút gọn đc
phân số 171 / 125 ko phải là phân số thập phân
23 tháng 7 2020
\(\frac{171}{125}\)Không phải là phân số thập phân.
Để đổi \(\frac{171}{125}\)ra phân số thập phân, ta làm như sau:
\(\frac{171}{125}=\frac{171\times8}{125\times8}=\frac{1368}{1000}\)
18 tháng 8 2016
a)Ta thấy: \(\begin{cases}x^2\\\left(2y-1\right)^2\end{cases}\ge0\)
\(\Rightarrow x^2+\left(2y-1\right)^2\ge0\)
\(\Rightarrow A\ge0\)
Dấu = khi \(\begin{cases}x^2=0\\\left(2y-1\right)^2=0\end{cases}\)\(\Leftrightarrow\begin{cases}x=0\\y=\frac{1}{2}\end{cases}\)
Vậy MinA=0 khi \(\begin{cases}x=0\\y=\frac{1}{2}\end{cases}\)
b)Ta thấy: \(\left(2x-1\right)^{2016}\ge0\)
\(\Rightarrow\left(2x-1\right)^{2016}-1\ge0-1=-1\)
\(\Rightarrow B\ge-1\)
Dấu = khi \(\left(2x-1\right)^{2016}=0\)\(\Leftrightarrow x=\frac{1}{2}\)
Vậy MinB=-1 khi \(x=\frac{1}{2}\)
18 tháng 8 2016
a) Ta có: x2 > 0 và (2y - 1)2 > 0
Vậy đạt giá trị nhỏ nhất của A = 0 khi:
x =0 và 2y - 1 = 0 => y = 1/2
b) Ta có:
(2x - 1)2016 > 0 .Vậy GTNN của (2x -1)2016 = 0 khi
x = 1/2.Do đó GTNN của B bằng : 0 - 1 = -1
DT
Đỗ Thanh Hải
CTVVIP
22 tháng 9 2021
32. Mrs Johnson is ______ of doing the same things every day
tired
keen
interested
surprised
33. Learning English is not easy.
1 điểm
It is not easy to learning English.
It is easy learning English.
It is not easy to learn English.
It is not difficult to learn English.
34. The furniture was ______.
so expense that I did buy it
enough cheap for me to buy
too expensive for me to buy
such expensive that I didn't buy it
35. It doesn’t seem necessary for us ______ every Monday
met
to meet
meeting
to meeting
36. Everyone has a number of acquaintances, but no one has many friends, for true friendship is not (36)___, and there are many people who seem to be (37)___ of it. For a friendship to be close and lasting, both the friends must have some very special qualities. The first quality is unselfishness. A person who is concerned only (38)___ his own interests and feelings cannot be a true friend. Friendship is a two-sided affair; it (39)___ by give-and-take, and no friendship can last long (40)___ is all give on one side and all take on the other.
secret
general
common
silent
37. Everyone has a number of acquaintances, but no one has many friends, for true friendship is not (36)___, and there are many people who seem to be (37)___ of it. For a friendship to be close and lasting, both the friends must have some very special qualities. The first quality is unselfishness. A person who is concerned only (38)___ his own interests and feelings cannot be a true friend. Friendship is a two-sided affair; it (39)___ by give-and-take, and no friendship can last long (40)___ is all give on one side and all take on the other.
impossible
incapable
unable
likely
38. Everyone has a number of acquaintances, but no one has many friends, for true friendship is not (36)___, and there are many people who seem to be (37)___ of it. For a friendship to be close and lasting, both the friends must have some very special qualities. The first quality is unselfishness. A person who is concerned only (38)___ his own interests and feelings cannot be a true friend. Friendship is a two-sided affair; it (39)___ by give-and-take, and no friendship can last long (40)___ is all give on one side and all take on the other.
with
from
for
in
39. Everyone has a number of acquaintances, but no one has many friends, for true friendship is not (36)___, and there are many people who seem to be (37)___ of it. For a friendship to be close and lasting, both the friends must have some very special qualities. The first quality is unselfishness. A person who is concerned only (38)___ his own interests and feelings cannot be a true friend. Friendship is a two-sided affair; it (39)___ by give-and-take, and no friendship can last long (40)___ is all give on one side and all take on the other.
stays
stands
keeps
lives
40. Everyone has a number of acquaintances, but no one has many friends, for true friendship is not (36)___, and there are many people who seem to be (37)___ of it. For a friendship to be close and lasting, both the friends must have some very special qualities. The first quality is unselfishness. A person who is concerned only (38)___ his own interests and feelings cannot be a true friend. Friendship is a two-sided affair; it (39)___ by give-and-take, and no friendship can last long (40)___ is all give on one side and all take on the other.
who
whose
which
whom
SV
Sinh Viên NEU
CTVVIP
23 tháng 12 2023
1 George made it clear what he wanted
2 She is easy to contact at work
12 tháng 9 2018
\(\frac{1}{1.2}+\frac{1}{2.3}+\frac{1}{3.4}+...+\frac{1}{99.100}\)
\(=1.\left(1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{99}-\frac{1}{100}\right)\)
\(=1.\left(1-\frac{1}{100}\right)\)
\(=1.\frac{99}{100}\)
\(=\frac{99}{100}\)
12 tháng 9 2018
\(\frac{1}{1.2}+\frac{1}{2.3}+...+\frac{1}{99.100}\)
\(=1-\frac{1}{2}+\frac{1}{2}-\frac{1}{3}+...+\frac{1}{99}-\frac{1}{100}\)
\(=1-\frac{1}{100}\)
\(=\frac{99}{100}\)
Hình như là fan BTS ms đúng mà~
LH
29 tháng 1 2019
Áp dụng bất đẳng thức Côsy cho các cặp số không âm (a^2,1);(b^2,1),(c^2,1) ta có: a^2 +1 >= 2a ; b^2 + 1 >= 2b ; c^2 + 1 >= 2c
Do đó: \(\frac{a}{a^2+1}+\frac{b}{b^2+1}+\frac{c}{c^2+1}\le\frac{a}{2a}+\frac{b}{2b}+\frac{c}{2c}=\frac{3}{2}\)
Đẳng thức xảy ra <=> a^2 = 1 ; b^2 = 1 ; c^2 = 1 <=> \(\hept{\begin{cases}a=\pm1\\b=\pm1\\c=\pm1\end{cases}}\)
22 tháng 9 2020
\(BPT\Leftrightarrow\left(2+\sqrt{x^2-2x+5}\right)\left(x+1\right)+\frac{2x\left(3x^2+2x-1\right)}{2\sqrt{x^2+1}+\sqrt{x^2-2x+5}}\le0\)
\(\Leftrightarrow\left(2+\sqrt{x^2-2x+5}\right)\left(x+1\right)+\frac{2x\left(x+1\right)\left(3x-1\right)}{2\sqrt{x^2+1}+\sqrt{x^2-2x+5}}\le0\)
\(\Leftrightarrow\left(x+1\right)\text{[}2+\sqrt{x^2-2x+5}+\frac{2x\left(3x-1\right)}{2\sqrt{x^2+1}+\sqrt{x^2-2x+5}}\text{]}\le0\)
\(\Leftrightarrow\left(x+1\right)\left(4\sqrt{x^2+1}+2\sqrt{x^2-2x+5}+2\sqrt{\left(x^2+1\right)\left(x^2-2x+5\right)}+7x^2-4x+5\right)\)\(\le0\Leftrightarrow x+1\le0\Leftrightarrow x\le-1\)
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