help me
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Her name is Suzi. She has long black hair and beautiful black eyes. I like her eyes very much. She's friendly, funny and useful. She usually helps me when I have difficult exercises. I like her because she always appeases me when I have bad feelings. Suzi is my best friend forever.
I have a special best friend who lives near my house and studys at the same school. His name is Hieu. He is known as a tall person with a kind heart and he is really handsome. He has black eyes and hair. He quite thin but he plays sports well. He is generous to everybody and agile when doing mission. I like him since he is so awesome, he not only loves helping teachers and friends but also plays an important roles in our class.
1 high
2 two white eggs
3 right hand
4 cave
5 huge brown bear
6 some grass
7 mother
4+6+8+...+x=928
Số số hạng là \(\dfrac{x-4}{2}+1=\dfrac{x-4+2}{2}=\dfrac{x-2}{2}\)
Tổng của dãy số là \(\dfrac{\left(x+4\right)\left(x-2\right)}{2}\cdot\dfrac{1}{2}=\dfrac{\left(x+4\right)\left(x-2\right)}{4}\)
Theo đề, ta có: \(\dfrac{\left(x+4\right)\left(x-2\right)}{2}=928\)
=>\(\left(x+4\right)\left(x-2\right)=928\cdot2=1856\)
=>\(x^2+2x-8-1856=0\)
=>\(x^2+2x-1864=0\)
=>\(x^2+2x+1-1865=0\)
=>\(\left(x+1\right)^2=1865\)
=>\(\left[{}\begin{matrix}x+1=\sqrt{1865}\\x+1=-\sqrt{1865}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\sqrt{1865}-1\left(loại\right)\\x=-\sqrt{1865}-1\left(loại\right)\end{matrix}\right.\)
Vậy: \(x\in\varnothing\)
1.I find ____ a useful sport for my health
a.swim b.swimming c.swimmer d.swam
2.when my father retired,he took_____ golf as a hobby to stay health
a.on b.at c.up d.in
3.Sometimes a rainbow_____after the rain.
a.appear b.appears c.not appear d.doesn't appears
4.Lan has the same hobby____Nga
a.as b.for c.of d.on
5.My father's hobby is ____stamps
a.collect b.collecting c.collector d.collection
6.I think collecting old bowls is a very____hobby
a.bore b.bored c.boring boreness
7.My uncle often gives me presents _____special occasions
a.in b.on c.of d.for
8.Do you háve a____hobby?
a.difficulty b.difficulties c.difficult d.differ
9.These gifts are made____eggshells
a.to b.for c.of d.at
Số số hạng dãy số đó là:(2024-2):2+1=1011
Tổng dãy số là:(2 + 2024) * 1012 / 2 = 1.026.028
Tổng là 1.026.028
(nêu tớ có tính sai thì cho xl trước nhé =(( )
Số số hạng của tổng \(2+4+6+8+...+2022+2024\) là:
\(\left(2024-2\right):2+1=1012\) (số)
Tổng \(2+4+6+8+...+2022+2024\) bằng:
\(\left(2024+2\right)\times1012:2=1025156\)
\(a.\left(x-2\right)\left(x^2+x-1\right)-x\left(x^2-1\right)\\ =\left(x^3+x^2-x-2x^2-2x+2\right)-\left(x^3-x\right)\\ =x^3-x^2-3x+2-x^3+x\\ =-x^2-2x+2\\ b.\left(2x-9\right)\left(2x+9\right)-4x^2\\ =\left[\left(2x\right)^2-9^2\right]-4x^2\\ =4x^2-81-4x^2\\ =-81\\ c.2x^2+3\left(x-1\right)\left(x-1\right)\\ =2x^2+3\left(x-1\right)^2\\ =2x^2+3\left(x^2-2x+1\right)\\ =2x^2+3x^2-6x+3\\ =5x^2-6x+3\)
a; (\(x\) - 2)(\(x^2\) + \(x\) - 1) - \(x\)(\(x^2\) - 1)
= \(x^3\) + \(x^2\) - \(x\) - 2\(x^2\) - 2\(x\) + 2 - \(x^3\) + \(x\)
= (\(x^3\) - \(x^3\)) - ( 2\(x^2\) - \(x^2\)) - (\(x\) + 2\(x\) - \(x\)) + 2
= 0 - \(x^2\) - (3\(x\) - \(x\)) + 2
= - \(x^2\) - 2\(x\) + 2
Quy tắc phát âm s/es:
- Phát âm là /es/ tức /s/ khi âm kết thúc là /p/, /k/, /t/, /f/
- Phát âm là /ɪz/ /khi âm kết thúc là /s/, /ss/, /ch/, /sh/, /x/, /z/, /o/, /ge/, /ce/.
- Phát âm là /z/ đối với những trường hợp còn lại.
\(#Likearose\)
11 B
12 C
13 A
14 C
15 C
16 B
17 A
18 A
19 D
20 B