Ta có:(x-6)(x+5) =< 0 

=>TH1 x-6>=0 và x+5 =<0

=>-4>x>5 (Vô lí)

TH2:x-6=<0 và x+5>=0

=>-6<x<7 =>x=(-5;-4;...;4;5;6)

Vậy x=(-5;-4;...5;6)

           ~ Học tốt ~

\(\left(x-6\right)\left(x+5\right)\le0\)

\(TH1:\left(x-6\right)\left(x+5\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}x-6=0\\x+5=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=6\\x=-5\end{cases}}\)

\(TH2:\left(x-6\right)\left(x+5\right)< 0\)

\(\Leftrightarrow x-6\) và \(x+5\) trái dấu.

Mà x - 6 < x + 5 nên \(\hept{\begin{cases}x-6< 0\\x+5>0\end{cases}}\Leftrightarrow\hept{\begin{cases}x< 6\\x>-5\end{cases}}\)

\(\Leftrightarrow-5< x< 6\)

\(\Leftrightarrow x\in\left\{;-5-4;-3;-2;-1;0;1;2;3;4;5;6\right\}\)

1+1=2

hok tốt

nhớ tk

m* quên mag link trên câu hỏi rồi!

X/12=-2/48 - 6/48

x/12=-8/48

=> x=-8

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A/ \(\frac{4}{5}+\frac{1}{5}x=\left(-\frac{1}{28}\right)\)

\(\frac{1}{5}x=\left(-\frac{1}{28}\right)-\frac{4}{5}\)

\(\frac{1}{5}x=\left(-\frac{5}{140}\right)-\frac{112}{140}\)

\(\frac{1}{5}x=-\frac{117}{140}\)

\(x=\left(-\frac{117}{140}\right):\frac{1}{5}\)

\(x=\left(-\frac{117}{28}\right)\)

B/ \(\left(\frac{3x}{7}+1\right):\left(-4\right)=-\frac{1}{28}\)

\(\frac{3x}{7}+1=\left(-\frac{1}{28}\right).\left(-4\right)\)

\(\frac{3x}{7}+1=\frac{1}{7}\)

\(\frac{3x}{7}=\frac{1}{7}-1\)

\(\frac{3x}{7}=\frac{1}{7}-\frac{7}{7}\)

\(\frac{3x}{7}=-\frac{6}{7}\)

\(\Rightarrow3x=\left(-6\right)\)(theo cách l8)

\(\Rightarrow x=\left(-6\right):3=\left(-2\right)\)

trên mạng 

Vai trò của hồ :

- Điều hòa dòng chảy của sông

- Là nơi dự trữ nguồn nước ngọt phong phú

- Phát triển thủy điện

- Tạo cảnh quan môi trường, phát triển du lịch.

làm mẫu nè

a) Đặt ( n+4 ; n+3)=d

\(\Rightarrow\hept{\begin{cases}n+4⋮d\\n+3⋮d\end{cases}}\)

\(\Rightarrow n+4-n+3⋮d\)

\(\Rightarrow1⋮d\)

\(\Rightarrow d\inƯ\left(1\right)=\left\{\pm1\right\}\)

Vậy phân số bla bla bla là phân số tối giản.

b. Đặt \(d=\left(n-1,n-2\right)\)

\(\Leftrightarrow\hept{\begin{cases}\left(n-1\right)⋮d\\\left(n-2\right)⋮d\end{cases}}\)

\(\Leftrightarrow\left[\left(n-1\right)-\left(n-2\right)\right]⋮d\)

\(\Leftrightarrow\left[n-1-n+2\right]⋮d\)

\(\Leftrightarrow1⋮d\Leftrightarrow d=1\)

Vậy \(\left(n-1,n-2\right)=1\) hay \(\frac{n-1}{n-2}\) là phân số tối giản.

c. Đặt \(d=\left(2n+3,4n+7\right)\)

\(\Leftrightarrow\hept{\begin{cases}\left(2n+3\right)⋮d\\\left(4n+7\right)⋮d\end{cases}}\Leftrightarrow\left[4\left(2n+3\right)\right]⋮d\)

\(\Leftrightarrow\left[4n+7-2\left(2n+3\right)\right]⋮d\)

\(\Leftrightarrow\left[4n+7-4n-6\right]⋮d\)

\(\Leftrightarrow1⋮d\Leftrightarrow d=1\)

Vậy \(\left(2n+3,4n+7\right)=1\)  hay \(\frac{2n+3}{4n+7}\) là phân số tối giản.

a)   X=-117/28

b)   X=-4

Chưa chắc đã đúng nha bạn

a. \(\frac{4}{5}+\frac{1}{5}x=\frac{1}{28}\)

\(\Leftrightarrow\frac{1}{5}x=\frac{1}{28}-\frac{4}{5}\)

\(\Leftrightarrow\frac{1}{5}x=\frac{5}{140}-\frac{112}{140}\)

\(\Leftrightarrow\frac{1}{5}x=\frac{-107}{140}\)

\(\Leftrightarrow x=\frac{-107}{140}\div\frac{1}{5}\)

\(\Leftrightarrow x=\frac{-107}{140}\times5\)

\(\Leftrightarrow x=\frac{-107}{28}=\)

b. \(\left(\frac{3x}{7}+1\right)\div\left(-4\right)=\frac{-1}{28}\)

\(\Leftrightarrow\left(\frac{3x}{7}+\frac{7}{7}\right)=\frac{-1}{28}\times\left(-4\right)\)

\(\Leftrightarrow\frac{3x+1}{7}=\frac{1}{7}\)

\(\Leftrightarrow3x+1=1\)

\(\Leftrightarrow3x=1-1\)

\(\Leftrightarrow3x=0\Leftrightarrow x=0\)