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ĐKXĐ : \(\left\{{}\begin{matrix}4x^2-1\ne0\\8x^3+1\ne0\end{matrix}\right.\Leftrightarrow x\ne\pm\dfrac{1}{2}\)
\(P=\dfrac{2x^5-x^4-2x+1}{4x^2-1}+\dfrac{8x^2-4x+2}{8x^3+1}\)
\(=\dfrac{\left(x^4-1\right)\left(2x-1\right)}{\left(2x-1\right)\left(2x+1\right)}+\dfrac{2\left(4x^2-2x+1\right)}{\left(2x+1\right)\left(4x^2-2x+1\right)}\)
\(=\dfrac{x^4-1}{2x+1}+\dfrac{2}{2x+1}=\dfrac{x^4+1}{2x+1}\)
\(P=\frac{2x^5-x^4-2x+1}{4x^2-1}+\frac{8x^2-4x+2}{ }\)
\(P=\frac{x^4\left(2x-1\right)-\left(2x-1\right)}{\left(2x-1\right)\left(2x+1\right)}+\frac{2\left(4x^2-2x+1\right)}{\left(2x+1\right)\left(4x^2-2x+1\right)}\)
\(P=\frac{\left(x^4-1\right)\left(2x-1\right)}{\left(2x-1\right)\left(2x+1\right)}+\frac{2}{2x+1}\)
\(P=\frac{x^4-1}{2x+1}+\frac{2}{2x+1}\)
\(P=\frac{x^4+1}{2x+1}\)
Vậy \(P=\frac{x^4+1}{2x+1}\)
\(A=\left(2x-1\right)^2-\left(5+x\right)\left(5-x\right)+4x\)
\(=4x^2-4x+1-\left(25-x^2\right)+4x\)
\(=4x^2-4x+1-25+x^2+4x\)
\(=5x^2-24\)
Thay x = -2 vào bt ,ta được: \(5.\left(-2\right)^2-24=-4\)
\(2x^3\left(x^2-5\right)+\left(-2x^3+4x\right)+\left(6+x\right)x^2\)
\(=2x^5-10x^3-2x^3+4x+6x^2+x^3=2x^5-9x^3+6x^2+4x\)
a: ĐKXĐ: \(x\notin\left\{5;-5\right\}\)
b: \(P=\dfrac{x-5+2x+10-2x-10}{\left(x+5\right)\left(x-5\right)}=\dfrac{x-5}{\left(x+5\right)\left(x-5\right)}=\dfrac{1}{x+5}\)
\(\left(2x-5\right)^2-4x.\left(x-5\right)+10\)
\(=\left(2x-5\right)^2-\left(4x\right)^2+20x+10\)
\(=\left(2x-5\right)^2-\left(2x\right)^2+20x+10\)
\(=[\left(2x-5\right)-2x].[\left(2x-5\right)+2x]+20x+10\)
\(=\left(2x-5-2x\right).\left(2x-5+2x\right)+20x+10\)
\(=-5.\left(4x-5\right)+20x+10\)
\(=-20x+25+20x+10\)
\(=35\)