b cần bài nào thế

bài 1\

a: (x-4)(x+5)>0

=>x-4>0 hoặc x+5<0

=>x>4 hoặc x<-5

b: (2x+1)(x-3)<0

=>2x+1>0 và x-3<0

=>-1/2<x<3

c: (x-7)(3-x)<0

=>(x-7)(x-3)>0

=>x>7 hoặc x<3

d: x^2+6x-16<0

=>(x+8)(x-2)<0

=>-8<x<2

e: 3x^2+7x+4<0

=>3x^2+3x+4x+4<0

=>(x+1)(3x+4)<0

=>3x+4>0 và x+1<0

=>-4/3<x<-1

f: 5x^2-9x+4>0

=>(x-1)(5x-4)>0

=>x>1 hoặc x<4/5

g: x^2+6x-16<0

=>(x+8)(x-2)<0

=>-8<x<2

h: x^2+4x-21>0

=>(x+7)(x-3)>0

=>x>3 hoặc x<-7

i: x^2-9x-22<0

=>(x-11)(x+2)<0

=>-2<x<11

l: 16x^2+40x+25<0

=>(2x+5)^2<0(loại)

m: 3x^2-4x-4>=0

=>3x^2-6x+2x-4>=0

=>(x-2)(3x+2)>=0

=>x>=2 hoặc x<=-2/3

Today, most children can go to school, so they all have to fulfill their responsibility to study well. Each child should choose a subject to study, learn about that subject so that it will help himself or her in many things or needs of life.I will tell you about my favorite subject, and that is English. English is the most widely used language. Depending on how you calculate it, besides nearly 400 million native speakers, English is understood and / or spoken by 1-1.6 million people worldwide. With more than a quarter of the world's population using this language, someone is always speaking English.  English plays a very important role in life and work in the future, English has many uses, so it is widely used because it is an easy language to learn and has many benefits. Sometimes we learn English because of personal interests . English for education, for tourism, for careers . I learn English 2 hours a day. During that time, I researched knowledge online, did English exercises, and communicated with foreigners through English learning software. I study English 6 days a week because I love English. My dream is become to a translater . it will take a lot of time for learning and learning to fulfill this dream ucows. I will always try and persevere. I believe if I have a will, my dream will come true !

As a student, each of us has some favorite subjects. A favorite subject is something we can repeatedly read without getting bored. We are always on our toes to read our favorite subject. However, at school, we can see that some students perform well in all subjects. The count of such students is less. The majority of students have a favorite subject. Almost every student has a favorite subject. It does not matter if it has associated with academics or arts.

⇒ Best place to visit in Vietnam is Hanoi. Because it's the capital of Vietnam and has the most of visitors from around the world, because it's has a lot of romantics.

In my house , I have a my room . It is the best room for me . I love it very much .I can store a lot of my important things in it. I will clean the room from time to time. There was a small bed in my room, which was just enough for me to sleep alone. There's also a small cupboard in the room to put up my clothes. Next to the bed where I slept, there was a white carpet under the small round table. That table was where I used to play chibi dolls. Ah, forgot the bookshelf on the headboard. The bookshelf is neatly lined with thick novels.Seeing me keep the room clean, my parents are very pleased.they kept complimenting me.I find it essential to keep the rooms in order.I love my room and I want the other rooms to be that.

Ai đó giúp mk với.Mk đội ơn nhiều lắm

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