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M=
Ta có: C= \(\frac{3^{99}}{3^{100}}\)+\(\frac{3^{98}}{3^{100}}\)+...+\(\frac{1}{3^{100}}\)
=\(\frac{3^{99}+3^{98}+...+3+1}{3^{100}}\)
=\(\frac{1+3+3^2+...+3^{99}}{3^{100}}\)
=\(\frac{3^{100}-1}{3^{100}}\)
=1
Vì n + 5/n + 2 có GT nguyên
Nên n + 5 chia hết cho n + 2
n + 2 + 3 chia hết cho n + 2
Mà n + 2 chia hết cho n + 2
Nên 3 chia hết cho n + 2
n + 2 thuộc U(3) = {-3 ; -1 ; 1 ; 3}
n thuộc {-5; -3 ; -1 ; 1}
Để n+5/n+2 có giá trị nguyên
=>n+5 chia hết cho n+2
=>n+2+3 chia hết cho n+2
Mà n+2 chia hết cho n+2
=>3 chia hết chon n+2
=>n+2 thuộc Ư(3)={-3;3;-1;1}
Ta có bảng sau
| n+2 | -3 | 3 | -1 | 1 |
| n | -5 | 1 | -3 | -1 |
| Vậy n thuộc {-5;1;-3;1} |
1. We (wait) for her for 30 minutes.
=>We have been waiting for her for 30 minutes
2. She (go) out since 5 a.m.
=>She has been going out since 5 a.m
3. They (not eat) anything all the morning.
=>They haven't been eating anything all the morning
4. The street is full of water because it (rain) for 3 hours.
=>The street is full of water because it has been raining for 3 hours
5. She looks very exhausted because she (work) all night.
=>She looks very exhausted because she has working all night
6. I (read) this book since last night.
=>I have been reading this book since last night
7. She (chat) with her friend all the day.
=>She has been chating with her friend all the day
8. He (talk) on the phone for hours.
=>He has been talking on the phone for hours
9. She (cycle) for 2 hours and she is very tired now.
=>She has been cycling for 2 hours and she is very tired now
GOOD LUCK!!!!!!!!!!
đây là câu trả lời của mk cậu tham khảo nha:
1.relowf->flower 6.icnipc->picnic
2.denkwee->weekend 7.pacm->camp
3.ioscaerb->aerobics 8.cehab->beach
4.atvaonic->vacation 9.sitvi->visit
5.adletic->citadel 10.mersmu->summer
1.relowf-> flower 6.icnipc-> picnic
2.denkwee-> weekend 7.pacm-> camp
3.ioscaerb-> aerobics 8.cehab-> beach
4.atvaonic-> vâcation 9.sitvi-> visit
5.adletic-> citadel 10.mersmu-> summer
1.
The homework was very difficult yesterday.
2.
Hello, everybody. I am sorry. I am late.
3.
– Where were you at 10 a.m last weekend?- I was in a clothing
store.
4.
– Where was your brother born?- He was born in New York.2
5.
The weather is beautiful today. It was rainy yesterday.
6.
The students are very tired today. They were at a party last night.
7.
We were in Hanoi in 2004.
8.
Now she is eighty. There were a lot of flowers at her
birthday party when she was eighteen.
1. số đó là : 77
2. -50
\(\frac{5}{11}\) của một số bằng 35. Số đó là........35 : 5/11...=35.11/5=....77...............
\(\frac{-4}{25}\) của một số bằng 8 . Số đó là.......-4/25 :8= -4.1/25.8=....-1/50......