Đăng nhập Đăng ký

anhthu_73

3 năm trước

(x+1/2021)+(x+2/2020)+(x+3/2019)=-3

Xem đáp án

1 câu trả lời

taihop60

3 năm trước

Đáp án:

Giải thích các bước giải:

$frac{x+1}{2021}+frac{x+2}{2020}+frac{x+3}{2019}=-3$

↔ $(\frac{x+1}{2021}+1)+(\frac{x+2}{2020}+1)+(\frac{x+3}{2019}+1)=0$

↔ $\frac{x+2022}{2021}+\frac{x+2022}{2020}+\frac{x+2022}{2019}=0$

↔ $(x+2022).(\frac{1}{2021}+\frac{1}{2020}+\frac{1}{2019}=0$

↔ $x+2022=0$ ↔ $x=-2022$

Đăng nhập để trả lời

Câu hỏi trong lớp Xem thêm

Read the passage and fill in the blank with the missing world Transport in London is expensive. The fare depends on the length of the journey; you cannot buy or book tickets in advance. Children under sixteen pay half, and those under five travel free. You usually buy bus tickets from the conductor, but some buses you pay the driver. Most London buses are double-deckers. On the underground railway ( or tube ) you buy your tickets from the machine or ticket office, and give up at the end of the journey. Not all trains from the platfrom go to the same place, so watch the signs. The last train leaves at 1.15 p.m. 1.The fare depends on the ................. of the journey. A.way B.distance C.time 2.Children under five don't have to ........... . When they use public transport. A.give B.pay C.buy 3.You should buy bus tickets from the .......... but on some buses you pay the driver. A.machine B.driver C.conductor 4.On the underground railway ( or tube ) you buy your ticket .............. the machine or ticket office. A.from B.in C.on 5.Not all trains from one ........... go to the same place, so watch the signs. A.station B.platfrom C.railway Giúp mik hứa vote 5*

8

8 lượt xem

2 đáp án

20 giờ trước

$5647+{5547}/{99}$ ................

9

9 lượt xem

2 đáp án

20 giờ trước

19/20+18/20+17/20+16/20

9

9 lượt xem

2 đáp án

20 giờ trước

${999}/{888}$ rút gọn

4

4 lượt xem

2 đáp án

20 giờ trước

What does the doctor recommend to eat?

366

366 lượt xem

1 đáp án

2 năm trước

What do happy people do?

322

322 lượt xem

1 đáp án

2 năm trước

What kind of food will help people to keep fit and stay healthy?

308

308 lượt xem

1 đáp án

2 năm trước