?bbbbb

\(\frac{x+2}{x+3}-\frac{5}{\left(x+3\right)\left(x-2\right)}-\frac{1}{x-2}\)

\(=\frac{\left(x+2\right)\left(x-2\right)}{\left(x+3\right)\left(x-2\right)}-\frac{5}{\left(x+3\right)\left(x-2\right)}-\frac{x+3}{\left(x-2\right)\left(x+3\right)}\)

\(=\frac{x^2-4-5-x-3}{\left(x+3\right)\left(x-2\right)}\)

\(=\frac{x^2-x-12}{\left(x+3\right)\left(x-2\right)}\)

\(=\frac{\left(x+3\right)\left(x-4\right)}{\left(x+3\right)\left(x-2\right)}\)

\(=\frac{x-4}{x-2}\)

\(\frac{x-2}{x-3}=\frac{x-3+1}{x-3}=1+\frac{1}{x-3}\)

\(\Rightarrow x-3\inƯ\left(1\right)=\left\{\pm1\right\}\)

cảm ơn bạn

\(-2x^2-10x-6=0\)\(\Leftrightarrow4x^2+20x+12=0\)\(\Leftrightarrow\left(4x^2+20x+25\right)-13=0\)\(\Leftrightarrow\left(2x+5\right)^2-\left(\sqrt{13}\right)^2=0\)\(\Leftrightarrow\left(2x+5+\sqrt{13}\right)\left(2x+5-\sqrt{13}\right)=0\)\(\Leftrightarrow\orbr{\begin{cases}2x+5+\sqrt{13}=0\\2x+5-\sqrt{13}=0\end{cases}}\)\(\Leftrightarrow\orbr{\begin{cases}x=\frac{-5-\sqrt{13}}{2}\\x=\frac{-5+\sqrt{13}}{2}\end{cases}}\)

-2x-10x-6=0

<=>-12x=6

<=>x=\(\frac{6}{-12}\)

<=>x=\(\frac{-1}{2}\)

Vậy x\(\in\left\{\frac{-1}{2}\right\}\)

x=-1/2

\(A=\frac{x^2-x}{x^2-9}-\frac{1}{x-3}+\frac{1}{x+3}\)

\(=\frac{x\left(x-1\right)}{\left(x-3\right)\left(x+3\right)}-\frac{1}{x-3}+\frac{1}{x+3}\)

\(=\frac{x\left(x-1\right)-x-3+x-3}{\left(x-3\right)\left(x+3\right)}\)

\(=\frac{x^2+x-6}{\left(x-3\right)\left(x+3\right)}\)

\(=\frac{\left(x-2\right)\left(x+3\right)}{\left(x-3\right)\left(x+3\right)}\)

\(=\frac{x-2}{x-3}\)

\(A=\frac{x^2-x}{x^2-9}-\frac{1}{x-3}+\frac{1}{x+3}\)

\(A=\frac{x^2-x}{x^2-3^2}-\frac{1}{x-3}+\frac{1}{x+3}\)

\(A=\frac{x^2-x}{\left(x-3\right)\left(x+3\right)}-\frac{x+3}{\left(x-3\right)\left(x+3\right)}+\frac{x-3}{\left(x-3\right)\left(x-3\right)}\)

\(A=\frac{x^2-x-\left(x+3\right)+x-3}{\left(x-3\right)\left(x+3\right)}\)

\(A=\frac{x^2-x-x-3+x-3}{\left(x-3\right)\left(x+3\right)}\)

\(A=\frac{x^2-x}{\left(x-3\right)\left(x+3\right)}\)

a) 4600

b)1200

c)4008000

/HT\

5009 nhé

năm 2009 năng suất lúa của xã yên sở là 10 tấn trên một héc-ta. năm 2010 năng suất tăng lên 12 tấn trên một héc-ta. hỏi năm 2010 xã yên sở đã tăng năng suất bao nhiêu phần trăm so với năm 2009

0

000000