bài 1.a. điều kiện xác định của phân thức là \(x^3-8\ne0\Leftrightarrow x\ne2\)

b .ta có \(\frac{3x^2+6x+12}{x^3-8}=\frac{3\left(x^2+2x+4\right)}{\left(x-2\right)\left(x^2+2x+4\right)}=\frac{3}{x+2}\)

bài 2.

\(A=\left(\frac{1}{x-1}-\frac{x}{1-x^3}.\frac{x^2+x+1}{x+1}\right):\frac{2x+1}{x^2+2x+1}\)

\(A=\left(\frac{1}{x-1}-\frac{x}{\left(1-x\right)\left(x^2+x+1\right)}.\frac{x^2+x+1}{x+1}\right).\frac{\left(x+1\right)^2}{2x+1}\)

\(A=\left(\frac{1}{x-1}-\frac{x}{\left(1-x\right)\left(x+1\right)}\right).\frac{\left(x+1\right)^2}{2x+1}\)

\(\Leftrightarrow A=\left(\frac{x+1+x}{\left(x-1\right)\left(x+1\right)}\right).\frac{\left(x+1\right)^2}{2x+1}=\frac{x+1}{x-1}\)

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

bài 1.

a.\(\left(x+4\right)\left(x^2-4x+16\right)=x^3-4^3=x^3-64\)

b.\(\left(x^2-\frac{1}{3}\right)\left(x^4+\frac{1}{3}x^2+\frac{1}{9}\right)=\left(x^2\right)^3-\left(\frac{1}{3}\right)^3=x^6-\frac{1}{27}\)

bài 2.

a.\(892^2+892.216+108^2=892^2+2.892.108+108^2\)

\(=\left(892+108\right)^2=1000^2=1_{ }000_{ }000\)

b.\(36^2+26^2-52.36=36^2+26^2-2.26.36=\left(36-26\right)^2=10^2=100\)

Tương tự mấy phần kia 

\(A=\frac{x+3}{x-2}+\frac{x+2}{3-x}+\frac{x+2}{x^2-5x+6}\)

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

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

\(=\frac{x^2-9-x^2+4+x+2}{\left(x-2\right)\left(x-3\right)}=\frac{-3+x}{\left(x-2\right)\left(x-3\right)}=\frac{-1}{x-2}\)

\(\frac{1}{x-2}-\frac{1}{x+2}+\frac{4x-x^2}{4-x^2}\)

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

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

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

\(\frac{1}{x-2}-\frac{1}{x+2}+\frac{4x-x^2}{4-x^2}\)

\(=\frac{1}{x-2}-\frac{1}{x+2}+\frac{x^2-4x}{x^2-4}\)

\(=\frac{1}{x-2}-\frac{1}{x+2}+\frac{x^2-4x}{\left(x-2\right)\left(x+2\right)}\)

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

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

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

\(\frac{2x^2-1}{x^2-xy}+\frac{1-2y^2}{x^2-xy}=\frac{2x^2-1+1-2y^2}{x^2-xy}\)

\(=\frac{2x^2-2y^2}{x^2-xy}=\frac{2\left(x^2-y^2\right)}{x\left(x-y\right)}\)

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

Sửa đề : \(\frac{2x^2-1}{x^2-xy}+\frac{1-2y^2}{x^2-xy}\)

\(=\frac{2x^2-1+1-2y^2}{x^2-xy}=\frac{2x^2-2y^2}{x\left(x-y\right)}=\frac{2\left(x^2-y^2\right)}{x\left(x-y\right)}\)

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

a, \(x^2-4x=0\Leftrightarrow x\left(x-4\right)=0\Leftrightarrow x=0;4\)

b, \(x^3+x^2-9x-9=0\Leftrightarrow x^2\left(x+1\right)-9\left(x+1\right)=0\)

\(\Leftrightarrow\left(x+1\right)\left(x^2-9\right)=0\Leftrightarrow\left(x+1\right)\left(x-3\right)\left(x+3\right)=0\Leftrightarrow x=-1;\pm3\)

c, \(x^2-3x-10=0\Leftrightarrow x^2+2x-5x-10=0\)

\(\Leftrightarrow\left(x-5\right)\left(x+2\right)=0\Leftrightarrow x=5;-2\)

a, \(20x^2y^3-15xy^2=5xy^2\left(4xy-3\right)\)

b, \(3x+3y-x^2-xy=3\left(x+y\right)-x\left(x+y\right)=\left(3-x\right)\left(x+y\right)\)

c, \(9-x^2-y^2+2xy=9-\left(x^2+y^2-2xy\right)\)

\(=3^2-\left(x-y\right)^2=\left(3-x+y\right)\left(3+x-y\right)\)

20x²y³ - 15xy² = 5xy²( 4xy - 3 )

3x + 3y - x² - xy = ( 3x + 3y ) - ( x² + xy ) = 3( x + y ) - x( x + y ) = ( x + y )( 3 - x )

9 - x² - y² + 2xy = 9 - ( x² - 2xy + y² ) = 3² - ( x - y )² = ( 3 - x + y )( 3 + x - y )