giúp e vs 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
HQ
Hà Quang Minh
Giáo viên
24 tháng 7 2023
\(x:y:z=\dfrac{4}{7}:\dfrac{5}{8}:\dfrac{9}{10}=160:175:252\)
4 tháng 1 2024
\(4x^4+1\)
\(=4x^4+4x^2+1-4x^2\)
\(=\left(2x^2+1\right)^2-\left(2x\right)^2\)
\(=\left(2x^2+1+2x\right)\left(2x^2+1-2x\right)\)
NV
Nguyễn Việt Lâm
Giáo viên
4 tháng 1 2024
\(4x^4+1=4x^4+4x^2+1-4x^2=\left(2x^2+1\right)^2-\left(2x\right)^2\)
\(=\left(2x^2-2x+1\right)\left(2x^2+2x+1\right)\)
T
1
SV
Sinh Viên NEU
CTVVIP
15 tháng 11 2023
1 If we continue polluting the air, the environment will be affected seriously
2 If we don't stop damaging birds' homes, there will be fewer birds left
3 If we continue polluting the water, there will be more disease in people and animals
4 If we keep polluting the land, the soil will not be safe enough for us to grow food in
5 If we use public transportation when we need, there will be less air pollution
12 Daniel signs up for a clean-up campaign so that he can join in it
13 People in my neighborhood clean the park up so that their children will have a nice place to play
14 Almost all the students in my school plant trees so that they can have much fresher air
14 tháng 11 2023
e: \(\dfrac{x^2+3x+9}{x^3+4x^2+4x}\cdot\dfrac{x^2+2x}{x^3-27x}\)
\(=\dfrac{x^2+3x+9}{x\left(x^2+4x+4\right)}\cdot\dfrac{x\left(x+2\right)}{x\left(x^2-27\right)}\)
\(=\dfrac{x^2+3x+9}{\left(x+2\right)^2}\cdot\dfrac{x+2}{x\left(x^2-27\right)}\)
\(=\dfrac{\left(x^2+3x+9\right)}{\left(x+2\right)\cdot x\left(x^2-27\right)}\)
f: \(\dfrac{2x^2+4xy+2y^2}{5x-5y}\cdot\dfrac{15x-15y}{2x^3+2y^3}\)
\(=\dfrac{2\left(x^2+2xy+y^2\right)}{5\left(x-y\right)}\cdot\dfrac{15\left(x-y\right)}{2\left(x^3+y^3\right)}\)
\(=\dfrac{\left(x+y\right)^2}{1}\cdot\dfrac{3}{\left(x+y\right)\left(x^2-xy+y^2\right)}\)
\(=\dfrac{3\left(x+y\right)}{x^2-xy+y^2}\)
g: \(\dfrac{x^3-4x}{x^2-7x+12}\cdot\dfrac{x-4}{x^2-2x}\)
\(=\dfrac{x\left(x^2-4\right)}{\left(x-3\right)\left(x-4\right)}\cdot\dfrac{x-4}{x\left(x-2\right)}\)
\(=\dfrac{x^2-4}{\left(x-3\right)\left(x-2\right)}=\dfrac{\left(x-2\right)\left(x+2\right)}{\left(x-3\right)\left(x-2\right)}=\dfrac{x+2}{x-3}\)
5 tháng 8 2023
m: \(=x^m\cdot x^2-x^m=x^m\left(x^2-1\right)=x^m\left(x-1\right)\left(x+1\right)\)
n: \(=5\cdot x^m\cdot x^2+10x^2\)
\(=5x^2\left(x^m+2\right)\)
o: \(=5x\left(x-2y\right)+2\left(x-2y\right)^2\)
\(=\left(x-2y\right)\left(5x+2x-4y\right)\)
=(x-2y)(7x-4y)
p: \(=7x\left(y-4\right)^2+\left(y-4\right)^3\)
\(=\left(y-4\right)^2\cdot\left(7x+y-4\right)\)
q: \(\left(4x-8\right)\left(x^2+6\right)-\left(4x-8\right)\left(x+7\right)+9\left(8-4x\right)\)
\(=\left(4x-8\right)\left(x^2+6-x-7\right)-9\left(4x-8\right)\)
\(=\left(4x-8\right)\left(x^2-x-10\right)\)
\(=4\left(x-2\right)\left(x^2-x-10\right)\)
5 tháng 8 2023
m) \(x^{m+2}-x^m\)
\(=x^m\cdot x^2-x^m\)
\(=x^m\left(x^2-1\right)\)
\(=x^m\left(x^2-1^2\right)\)
\(=x^m\left(x-1\right)\left(x+1\right)\)
n) \(5x^{m+2}+10x^2\)
\(=5x^m\cdot x^2+10x^2\)
\(=5x^2\cdot x^m+10x^2\)
\(=5x^2\left(x^m+2\right)\)
o) \(5x\left(x-2y\right)+2\left(2y-x\right)^2\)
\(=5x\left(x-2y\right)+2\left(x-2y\right)^2\)
\(=\left(x-2y\right)\left[5x+2\left(x-2y\right)\right]\)
\(=\left(x-2y\right)\left(5x+2x-4y\right)\)
\(=\left(x-2y\right)\left(7x-4y\right)\)
p) \(7x\left(y-4\right)^2-\left(4-y\right)^3\)
\(=7x\left(4-y\right)^2-\left(4-y\right)^3\)
\(=\left(4-y\right)^2\left[7x-\left(4-y\right)\right]\)
\(=\left(4-y\right)^2\left(7x-4+y\right)\)
q) \(\left(4x-8\right)\left(x^2+6\right)-\left(4x-8\right)\left(x+7\right)+9\left(8-4x\right)\)
\(=4\left(x-2\right)\left(x^2+6\right)-4\left(x-2\right)\left(x+7\right)-36\left(x-2\right)\)
\(=4\left(x-2\right)\left[\left(x^2+6\right)-\left(x+7\right)-9\right]\)
\(=4\left(x-2\right)\left(x^2+6-x-7-9\right)\)
\(=4\left(x-2\right)\left(x^2-x-10\right)\)
20 tháng 6 2023
Gọi vận tốc xe 1 và xe 2 lần lượt là a,b
Theo đề, ta có:
1/4a=1/3b và 1,6(a+b)=112
=>a=40; b=30
TT
1
30 tháng 7 2023
14:
a: Xét ΔHNM vuông tại H và ΔMNP vuông tại M có
góc N chung
=>ΔHNM đồng dạng với ΔMNP
b: NP=căn 3^2+4^2=5cm
MH=3*4/5=2,4cm
NH=3^2/5=1,8cm
13:
a: 3x+5=x-5
=>2x=-10
=>x=-5
b: (x-2)(2x+5)=0
=>x-2=0 hoặc 2x+5=0
=>x=2 hoặc x=-5/2
c: =>2(5x-2)=3(3x+1)
=>10x-4=9x+3
=>x=7
d: =>(3x+6-x+1)/(x+2)(x-1)=17-3x/(x+2)(x-1)
=>2x+7=17-3x
=>5x=10
=>x=2
Ai giúp mk vs ạ 🥲😞
V
1People won't use flying cars until the year 2050
2Do you think the fuel price will increase next month?
3The mail won't arrive until next week
4I don't think he will take the new position
5We will use solar energy in the future
6If i study, i will pass the exams
7If the sun shines , we will walk to the town
8If he has a temperature , he will see the doctor
9If we travel to London , we will visit the museums
10If Rita forgets her homework, the teacher will give her a low mark