Giúp e vs( được câu nào hay câu nấy ah)
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DV
3
H
25 tháng 12 2021
nói thế mình giúp 1 câu thôi đấy bạn :)))
bạn có thể đăng 10 câu mỗi lần đăng thì mình giúp hết đc ạ
17 tháng 10 2023
2: x+13 là bội của x-1
=>\(x+13⋮x-1\)
=>\(x-1+12⋮x-1\)
=>\(x-1\inƯ\left(12\right)\)
mà x-1>=-1(vì x là số tự nhiên)
nên \(x-1\in\left\{-1;1;2;3;4;6;12\right\}\)
=>\(x\in\left\{0;2;3;4;5;7;13\right\}\)
3: 4x+9 là bội của 2x+1
=>\(4x+9⋮2x+1\)
=>\(4x+2+7⋮2x+1\)
=>\(2x+1\in\left\{1;7\right\}\)
=>\(x\in\left\{0;3\right\}\)
30 tháng 6 2023
1:
a: x^2+y^2-2x-2y-2=0
=>x^2-2x+1+y^2-2y+1-4=0
=>(x-1)^2+(y-1)^2=4
=>R=2 và I(1;1)
b:x^2+y^2-6x+4y-12=0
=>x^2-6x+9+y^2+4y+4-25=0
=>(x-3)^2+(y+2)^2=25
=>R=5 và I(3;-2)
4:
a: \(R=d\left(I;\text{Δ}\right)=\dfrac{\left|3\cdot4+4\cdot\left(-3\right)+15\right|}{\sqrt{4^2+\left(-3\right)^2}}=3\)
(C) có phương trình là:
(x-3)^2+(y-4)^2=3^2=9
b: \(R=d\left(I;\text{Δ}\right)=\dfrac{\left|2\cdot5+3\cdot\left(-12\right)-7\right|}{\sqrt{5^2+\left(-12\right)^2}}=\dfrac{33}{13}\)
(C) có phương trình là;
(x-2)^2+(y-3)^2=R^2=1089/169
S
_silverlining
CTVVIP
13 tháng 1
1. My daughter has learnt English for two years.
_ My daughter started....learning English 2 years ago ..............................................................................
2. Although Tuan took a taxi, he still arrived late for the interview.
_ In spite of........having taken a taxi, Tuan still arrived late for the interview. .........................................................................................
3. My brother works in a factory which has more than a thousand employees.
_ There are......more than a thousand employees in my brother's company ............................................................................................
4. Nam and his family went on a trip to their home village for two days.
_ Nam and his family had a two-day trip to their home village. ............................................................................
5. Keeping the environment clean is very important.
_ It's....very important to keep the environment clean. ........................................................................................................
6. They will show the time machine to the public when they finish it.
_ The time machine......will be shown to the public when it is finished. .................................................................................
7. Old car tires are recycled to make shoes and sandals.
_ People recycle old car tires to make shoes and sandals.
........................................................................................................
8. It’s three years since I last saw her in this city.
_ I haven’t seen her in this city for 3 years.
....................................................................................................
9. Tam doesn’t type as fast as she used to.
_ Tam used.to type faster than she does now
..................................................................................................
10. “ Please turn down the radio for me'’, said my father.
_ My father asked......me to turn down the radio...................................................................................
TH
1
KY
9 tháng 5 2022
Mary if she could speak some foreign languages
Lan if she was going to visit her aunt the day after
what I was doing
how she was feeling then
what I usually did in my free time
why he why he didn't come there to meet her
why I was so lazy and naughty
like playing soccer, don't you?
goes to school late, doesn't he?
can swim very well, can't you?
is going to the party, isn't she?
was published in Germany in 1550, wasn't it?
are sold all over the world, aren't they?
have been built this year, haven't they?
was given a book, wasn't he?
was bought by Mrs Brown yesterday, wasn't she?
is used every day, isn't it?
be beautiful sights in this village when I lived here