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\(=\frac{x-12}{6\left(x-6\right)}-\frac{6}{x\left(x-6\right)}\)
\(=\frac{x^2-12x-36}{6x\left(x-6\right)}\)
\(=\frac{\left(x-6-6\sqrt{2}\right)\left(x-6+6\sqrt{2}\right)}{6x\left(x-6\right)}\)
\(\frac{x-12}{6x-36}-\frac{6}{x^2-6x}=\frac{\left(x-12\right)\left(x^2-6x\right)}{\left(6x-36\right)\left(x^2-6x\right)}-\frac{6\left(6x-36\right)}{\left(x^2-6x\right)\left(6x-36\right)}\)
\(=\frac{x^3-6x^2-12x^2+72x}{\left(6x-36\right)\left(x^2-6x\right)}-\frac{36x-216}{\left(x^2-6x\right)\left(6x-36\right)}\)
\(=\frac{x^3-18x^2+72x-36x+216}{\left(6x-36\right)\left(x^2-6x\right)}=\frac{x^3-18x^2+36x+216}{\left(6x-36\right)\left(x^2-6x\right)}\)
a)\(\Rightarrow\frac{3}{2.\left(x+3\right)}-\frac{x-6}{2x.\left(x+3\right)}\)
\(\Rightarrow\frac{3x-x+6}{2x.\left(x+3\right)}\)
\(\Rightarrow\frac{2x+6}{2x.\left(x+3\right)}=\frac{2.\left(x+3\right)}{2x.\left(x+3\right)}=\frac{2}{2x}=\frac{1}{x}\)
b
=\(\frac{96x^4-75y^7}{40x^3y^3}\)
c, phan tich ra:
=\(\frac{\left(x-2\right)\left(x+2\right)}{3\left(x+4\right)}.\frac{x+4}{2\left(x-2\right)}=\frac{x+2}{6}\)
=
Bài làm:
đk: \(x\ne-3;x\ne1\)
Ta có: \(\frac{x^2+6x+9}{1-x}\cdot\frac{\left(x-1\right)^3}{2\left(x+3\right)^3}\)
\(=\frac{\left(x+3\right)^2}{-\left(x-1\right)}\cdot\frac{\left(x-1\right)^3}{2\left(x+3\right)^3}\)
\(=\frac{-\left(x-1\right)^2}{2\left(x+3\right)}\)
\(=-\frac{x^2-2x+1}{2x+6}\)
\(ĐKXĐ:\hept{\begin{cases}x\ne-3\\x\ne1\end{cases}}\)
\(\frac{x^2+6x+9}{1-x}.\frac{\left(x-1\right)^3}{2\left(x+3\right)^3}=\frac{-\left(x+3\right)^2}{x-1}.\frac{\left(x-1\right)^3}{2\left(x+3\right)^3}=\frac{-\left(x-1\right)^2}{2\left(x+3\right)}\)
\(A=\left(\frac{6x+1}{x^2-6x}+\frac{6x-1}{x^2+6x}\right)\times\frac{x^2-36}{12x^2+12}\)
\(A=\left[\frac{6x+1}{x\left(x-6\right)}+\frac{6x-1}{x\left(x+6\right)}\right]\times\frac{\left(x+6\right)\left(x-6\right)}{12\left(x^2+1\right)}\)
\(A=\frac{6x^2+36x+x+6+6x^2-36x-x+6}{x}\times\frac{1}{12\left(x^2+1\right)}\)
\(A=\frac{12\left(x^2+1\right)}{x}\times\frac{1}{12\left(x^2+1\right)}=\frac{1}{x}\)
\(\frac{3x}{5x+5y}-\frac{x}{10x-10y}\)
\(=\frac{3x}{5\left(x+y\right)}-\frac{x}{10\left(x+y\right)}\)
\(=\frac{30x\left(x-y\right)-5x\left(x+y\right)}{5\left(x+y\right).10\left(x+y\right)}\)
\(=\frac{5x\left(5x-7y\right)}{50\left(x+y\right)\left(x-y\right)}\)
\(=\frac{x\left(5x-7y\right)}{\left(x+y\right)\left(x-y\right)}\)
chỗ cuối tớ sai
\(=\frac{x\left(5x-7y\right)}{10\left(x+y\right)\left(x-y\right)}\)
đây nha , e xin lỗi