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28 tháng 5 2018

Combine sentences using ; where,when,or which

1.Manchester is the largest city in USA . My brother lives there.

=>Manchester is the largest City in USA where My brother lives there.

2.I've recently gone back to the town . I was born in the town.

=>l've recently gone back to the town When l was born in the town.

28 tháng 5 2018

Mình hơi bận xin lỗi nha

3.Do you know the name of the hotel ; John is staying at the hotel

=>Do you know the name of the hotel which John is staying at the hotel.

4.We enjoy the city .We spent our vacation there.

=>we enjoy the city where we spent our vacation there.

5.We enjoy this city . It has been renewed a lot after the war.

=>We enjoy this City which it has been renewed a lot after the war.

6.4th June is the day . I was born on that day.

=>4th June is the day when l was born on that day.

7.This is the house . The house has a big garden.

=>This is the house where the house has a big garden.

8.This is the house . I was born in the house.

=>This is the house where l was born in the house.

9.May Day is the day . People hold a meeting on that day.

=>May Day is the day when people hold a meeting on that day.

10.Ha Noi is the place . I'd like to come to Ha Noi.

=>Ha Noi is the place which l'd lie to Come to Ha Noi

11.Summer is the time . The weather is very hot then.

=>Summer is the time when the weather is very hot then .

12.I don't like Summer .It's often hot then

=>l don't like summer when it's often Hot then.

13.The bed was comfortable . I slept in it last night.

=>The bed was comfortable which l slept in it Last night.

Bổ sung đề: \(\frac{a_1}{a_2}=\frac{a_2}{a_3}=\frac{a_3}{a_4}\)

Đặt \(\frac{a_1}{a_2}=\frac{a_2}{a_3}=\frac{a_3}{a_4}=k\)

=>\(\begin{cases}a_3=a_4\cdot k\\ a_2=a_3\cdot k=a_4\cdot k^2\\ a_1=a_2\cdot k=a_4\cdot k^3\end{cases}\)

\(\frac{a_1^3+a_2^3+a_3^3}{a_2^3+a_3^3+a_4^3}=\frac{\left(a_2\cdot k\right)^3+\left(a_3\cdot k\right)^3+\left(a_4\cdot k\right)^3}{a_2^3+a_3^3+a_4^3}=\frac{k^3\left(a_2^3+a_3^3+a_4^3\right)}{a_2^3+a_3^3+a_4^3}=k^3\)

\(\frac{\left(a_1+a_2+a_3\right)^3}{\left(a_2+a_3+a_4\right)^3}=\frac{\left(a_2\cdot k+a_3\cdot k+a_4\cdot k\right)^3}{\left(a_2+a_3+a_4\right)^3}=\frac{k^3\left(a_2+a_3+a_4\right)^3}{\left(a_2+a_3+a_4\right)^3}=k^3\)

Do đó: \(\frac{a_1^3+a_2^3+a_3^3}{a_2^3+a_3^3+a_4^3}=\frac{\left(a_1+a_2+a_3\right)^3}{\left(a_2+a_3+a_4\right)^3}\) (ĐPCM)

16 tháng 12 2015

ngu em mk no tai lên mk trả lời cho

ta có

a1/a2=a1+a2+a3+...+a2003/a2+a3+a4+...+a2004 (1)

a2/a3=a1+a2+a3+...+a2003/a2+a3+a4+....+a2004 (2)

..........................

a2003/a2004=a1+a2+a3+........+a2003/a2+a3+a4+..............+a2004 (2003)

nhân các đẳng thưcs trên ta được

a1/a2*a2/a3*............*a2003/a2004=(a1+a2+a3+...+a2003/a2+a3+a4+.....+a2004)^2003

rút gon vế trái ta đc

a1/a2004=(a1+a2+a3+...+a2003/a2+a3+a4+....+a2004)^2003

dài quá máy mình ko tải nủi

26 tháng 1 2016

làm được mấy vế thì làm ko cần làm hết đâu! giúp nha!

4 tháng 12 2021

A

4 tháng 12 2021

A

27 tháng 11 2021

C

19 tháng 10 2016

mày là thằng hay là con

19 tháng 10 2016

con chó chết với con chuột chết tao là hs đại học đây! 

chào chưa