Gọi  \(ƯCLN\left(6n+5;3n+2\right)\) là d.

\(\Rightarrow\hept{\begin{cases}6n+5⋮d\\3n+2⋮d\end{cases}}\)

\(\Rightarrow\hept{\begin{cases}6n+5⋮d\\2\left(3n+2\right)⋮d\end{cases}}\)

\(\Rightarrow\hept{\begin{cases}6n+5⋮d\\6n+4⋮d\end{cases}}\)

\(\Rightarrow\left(6n+5\right)-\left(6n+4\right)⋮d\)

\(\Rightarrow1⋮d\)

\(\Rightarrow d=1\)

\(\Rightarrow\left(6n+5;3n+2\right)=1\)

\(\Rightarrow\frac{6n+5}{3n+2}\) tối giản.

\(\frac{6n+5}{3n+2}\)tối giản

=>6n+5 chia hết cho 3n+2 

=>(6n+5)-2(3n+2)chia hết cho 3n+2

=>6n+5-6n-4 chia hết cho 3n+2

=>1 chia hết cho 3n+2

=>đpcm

Chứng minh P tối giản, ta đưa về chứng minh bài toán quen thuộc sau :

Chứng minh \(\left(6n+5;3n+2\right)=1\)

Bài làm:

Gọi \(\text{ƯCLN}\left(6n+5;3n+2\right)=d\)

Ta có : \(\hept{\begin{cases}6n+5⋮d\\3n+2⋮d\end{cases}\Leftrightarrow\hept{\begin{cases}6n+5⋮d\\6n+4⋮d\end{cases}}}\)

Từ đây ta có : \(\left(6n+5\right)-\left(6n+4\right)⋮d\)

\(\Leftrightarrow1⋮d\)

\(\Leftrightarrow d\inƯ\left(1\right)=\left\{1\right\}\)

Vậy \(\text{ƯCLN}\left(6n+5;3n+2\right)=1\)ta có đpcm

Bài toán kết thúc...

\(\left(x-2020\right)\left(x-2021\right)=0\)

\(\Rightarrow\orbr{\begin{cases}x-2020=0\\x-2021=0\end{cases}\Leftrightarrow\orbr{\begin{cases}x=0+2020=2020\\x=0+2021=2021\end{cases}}}\)

Vậy \(x=2020;2021\)

\(\left(x-2020\right)\left(x-2021\right)=0\)

\(\Leftrightarrow\hept{\begin{cases}x-2020=0\\x-2021=0\end{cases}}\Leftrightarrow\hept{\begin{cases}x=2020\\x=2021\end{cases}}\)

vậy x=2020 hoặc x=2021

Anh sửa lại bài một xíu nhé !

Ta có : \(\left(x-2020\right).\left(x-2021\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}x-2020=0\\x-2021=0\end{cases}\Leftrightarrow}\orbr{\begin{cases}x=2020\\x=2021\end{cases}}\)

Vậy \(x=2020\) hoặc \(x=2021\)

Trả lời : 

Tôi nghĩ chúng ta phải bảo vệ sức khỏe để phòng ngừa bệnh cúm . giữ sức khỏe chúng ta có cách là chăm sóc tốt bản thân mình , giấc ngủ và chất dinh dưỡng cũng ngăn cản được lạnh của cúm .

hok tốt

tiếng anh nhé

Some remedies to prevent the flu essay (Một vài biện pháp để phòng tránh bệnh cúm bằng tiếng anh

I think we need to stay healthy to prevent the flu, keep as healthy as i can by taking good care of myself. Sleep and nutritional considerations are help to prevent the onset of a cold or flu, a healthy lifestyle helps my immune system to be in its best possible shape, giving me the best chance of being able to fight off the onset of a cold or flu.

I need to eat healthily. Healthy foods such as vegetables, fruit, grains, etc., are an important part of keeping my body nutrition at its optimum. Processing fatty and sugary foods don't give the immune-boosting protection that healthier food does. Sugary foods can decrease immune function.

Exercise regularly. Exercise has enhancing immune-system that can help ward off illness. Overdo too much strenuous or excessive can leave me prone to illness, too. I make sure to get adequate sleep every night, get at least seven to eight hours sleep nightly

          I need to reduce my stress too. Stress can harm the ability of my immune system to work optimally, and people who are stressed tend to catch colds more than less stressed people. Manage my stress is contributing to prevent the flu. Beside, Drinking water may also help wash cold and flu viruses from my throat to my stomach where they cannot survive. Although getting cold doesn't actually cause a cold or flu (the viruses do), but being cold can reduce my stamina and make me feel miserable and fatigued, so i need to stay warm.

In addition, i eat more fruits to get vitamin C that might help me prevent the common cold, and i will also drink more milk, this will be help me healthy and stronger to prevent the cold

\(x\times2019-x=2018\times2018+2018\)

\(x\times\left(2019-1\right)=2018\times\left(2018+1\right)\)

\(x\times2018=2018\times2019\)

\(\Rightarrow x=2019\)

X x 2019 - x =2018 x 2018 + 2018

X x(2019-1) = 2018 x(2018 + 1)

X x 2018 = 2018 x 2019

=> X=2019

Vậy X=2019.

Mơn mấy bn ^^ 

Mọi ngừi ơi mau lên nha mik đang cần gấp 

=81.04

HT~

23,90+86,10-28,96=....? ai đúng và ai nhanh nhất mik sẽ k nhé

23,90 + 86,10 - 28,96 = 

= 81,04

@Trungmh

sorry,em mới học lớp 5

K sao đâu e

sorry em mới hok lớp 4!⌨️ ⌨️ ⌨️

Ta có: \(\Rightarrow\) x-(-d-e-f)

 \(\Rightarrow\)x+d+e+f nha!

x - d + e - f

mình nhanh nhất

ta có: x-[-d - e + (-f)]

    = x - ( -d - e - f)

    = x + d + e + f

năm mới zui zẻ !! 453464574575685697247646457567568568595631632634645745756785634

~ Chúc bạn ho tốt ~ !!!!!!!!!!!!

nhanh vậy