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25 tháng 3 2023

a) \(f\left(x\right)+g\left(x\right)-h\left(x\right)\)

\(=\left(2x^5-4^4x^4+3x^3-x^2+5x-1\right)+\left(-x^5+2x^4-3x^3-x^2-2x+7\right)-\left(x^5-2x^4-2x^2-x-3\right)\)

\(=2x^5-4x^4+3x^3-x^2+5x-1-x^5+2x^4-3x^3-x^2-2x+7-x^5+2x^4+2x^2+x+3\)\(=\left(2x^5-x^5-x^5\right)-\left(4x^4-2x^4-2x^4\right)+\left(3x^3-3x^3\right)-\left(x^2+x^2-2x^2\right)+\left(5x-2x+x\right)-\left(1-7-3\right)\)

\(=0-0+0-0+4x-9\)

\(=4x-9\)

`a,`

`f(x)+g(x)-h(x)=(2x^5-4x^4+3x^3-x^2+5x-1)+(-x^5+2x^4-3x^3-x^2-2x+7)-(x^5-2x^4-2x^2-x-3)`

`= 2x^5-4x^4+3x^3-x^2+5x-1+ -x^5+2x^4-3x^3-x^2-2x+7-x^5+2x^4+2x^2+x+3`

`= (2x^5-x^5-x^5)-(4x^4-2x^4-2x^4)+(3x^3-3x^3)-(x^2-2x^2)-(2x-x)+(-1+7+3)`

`= 0-0+0-(-x^2)-x+10 = x^2-x+9`

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

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

15 tháng 11 2023

Em cảm ơn ạ

12 tháng 11 2023

9. A
10. D
5. A
6. B
7. D
8. B
 

13 tháng 11 2023

9 A

10 D

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: \(\dfrac{x^3-4x}{x^2-7x+12}\cdot\dfrac{x-4}{x^2-2x}\)

\(=\dfrac{x\left(x^2-4\right)}{\left(x-3\right)\left(x-4\right)}\cdot\dfrac{x-4}{x\left(x-2\right)}\)

\(=\dfrac{x^2-4}{\left(x-3\right)\left(x-2\right)}=\dfrac{\left(x-2\right)\left(x+2\right)}{\left(x-3\right)\left(x-2\right)}=\dfrac{x+2}{x-3}\)

14 tháng 11 2023

Em cảm ơn nhìu ạ 😍❤️

11 tháng 11 2023

:)

1.B dynamite
2.B disappear
3.B refreshment
4.C disappointed
5.C division
6.C disappointment
7.B congratulate
8.D inedible
9.C congratulation
10.A oceanic

--thodagbun--

11 tháng 11 2023

Tớ lm thêm cho bẹ tk :) á

 

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) \(\left(4x-8\right)\left(x^2+6\right)-\left(4x-8\right)\left(x+7\right)+9\left(8-4x\right)\)

\(=4\left(x-2\right)\left(x^2+6\right)-4\left(x-2\right)\left(x+7\right)-36\left(x-2\right)\)

\(=4\left(x-2\right)\left[\left(x^2+6\right)-\left(x+7\right)-9\right]\)

\(=4\left(x-2\right)\left(x^2+6-x-7-9\right)\)

\(=4\left(x-2\right)\left(x^2-x-10\right)\)

6 tháng 12 2021

enough strong => strong enough nhé bạn, adj + enough / enough + noun