\(\frac{5}{x+5}\)- \(\frac{x-3}{5-x}\)= \(\frac{2x-40}{x^2-25}\)
giải phương trình trên
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ĐKXĐ : \(x\ne0;x\ne\pm5\)
\(\frac{x+5}{x^2-5x}-\frac{x-5}{2x^2+10x}=\frac{x+25}{2x^2-50}\)
\(\Leftrightarrow\frac{x+5}{x\left(x-5\right)}-\frac{x-5}{2x\left(x+5\right)}=\frac{x+25}{2\left(x-5\right)\left(x+5\right)}\)
\(\Leftrightarrow\frac{2\left(x+5\right)^2}{2x\left(x-5\right)\left(x+5\right)}-\frac{\left(x-5\right)^2}{2x\left(x-5\right)\left(x+5\right)}=\frac{x\left(x+25\right)}{2x\left(x-5\right)\left(x+5\right)}\)
\(\Rightarrow2\left(x+5\right)^2-\left(x-5\right)^2=x\left(x+25\right)\)
\(\Leftrightarrow2x^2+20x+50-x^2+10x-25=x^2+25x\)
\(\Leftrightarrow5x+25=0\)
\(\Leftrightarrow x=-5\)(ko t/m ĐKXĐ)
Vậy phương trình vô nghiệm.
\(\frac{x+5}{x\left(x-5\right)}-\frac{x-5}{2x\left(x+5\right)}=\frac{x+25}{2\left(x-5\right)\left(x+5\right)}\)
\(\Leftrightarrow\)tu giai ra de ma
\(ĐKXĐ:x\ne\pm5\)
\(\frac{5}{x+5}-\frac{x-3}{5-x}=\frac{2x-40}{x^2-25}\)
\(\Leftrightarrow\frac{5}{x+5}+\frac{x-3}{x-5}-\frac{2x-40}{\left(x-5\right)\left(x+5\right)}=0\)
\(\Leftrightarrow\frac{5x-25+x^2+2x-15-2x+40}{\left(x-5\right)\left(x+5\right)}=0\)
\(\Leftrightarrow x^2+5x=0\)
\(\Leftrightarrow x\left(x+5\right)=0\)
\( \Leftrightarrow\left[{}\begin{matrix}x=-5\left(ktm\right)\\x=0\left(tm\right)\end{matrix}\right.\)
Vậy \(S=\left\{0\right\}\)
ĐKXĐ: x∉{-5;5}
Ta có: \(\frac{5}{x+5}-\frac{x-3}{5-x}=\frac{2x-40}{x^2-25}\)
\(\Leftrightarrow\frac{5}{x+5}+\frac{x-3}{x-5}=\frac{2x-40}{x^2-25}\)
\(\Leftrightarrow\frac{5\left(x-5\right)}{\left(x+5\right)\left(x-5\right)}+\frac{\left(x-3\right)\left(x+5\right)}{\left(x-5\right)\left(x+5\right)}=\frac{2x-40}{\left(x-5\right)\left(x+5\right)}\)
Suy ra: \(5\left(x-5\right)+\left(x-3\right)\left(x+5\right)=2x-40\)
\(\Leftrightarrow5x-25+x^2+2x-15=2x-40\)
\(\Leftrightarrow x^2+7x-40-2x+40=0\)
\(\Leftrightarrow x^2+5x=0\)
\(\Leftrightarrow x\left(x+5\right)=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x+5=0\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=0\left(tm\right)\\x=-5\left(ktm\right)\end{matrix}\right.\)
Vậy: S={0}
3/(x^2-13x+40)+2/(x^2-8x+15)+1/(x^2-5x+6)+6/5+0
3/(x-8)(x-5)+2/(x-5)(x-3)+1/(x-3)(x-2)+6/5=0
1/(x-8)-1/(x-5)+1/(x-5)-1/(x-3)+1/(x-3)-1/(x-2)+6/5=0
1/(x-8)-1/(x-2)+6/5=0
ban tu giai tiep nhan
m^2x+2x=5-3mx
m^2x+3mx+2x=5
x(m^2+3m+2)=5
khi 0x=5 thi pt vo nghiem
m^2+3m+2=0
(m+1)(m+2)=0
m=-1 hoac m=-2
Bạn nào cho mk 1 ik, mk cho bn ý 3 ik luôn. Mk hứa nếu nói dối bạn có thể Báo cáo sai phạm mk.
\(ĐKXĐ:x\ne\pm5\)
\(\frac{5}{x+5}-\frac{x-3}{5-x}=\frac{2x-40}{x^2-25}\)
\(\Leftrightarrow\frac{5}{x+5}+\frac{x-3}{x-5}=\frac{2x-40}{x^2-25}\)
\(\Leftrightarrow\frac{5x-25+5x-15}{x^2-25}=\frac{2x-40}{x^2-25}\)
\(\Rightarrow10x-40=2x-40\)
\(\Leftrightarrow x=0\left(TMĐKXĐ\right)\)
Vậy x=0
\(\frac{5}{x+5}-\frac{x-3}{5-x}=\frac{2x-40}{x^2-25}\) ( đkxđ : \(x\ne\pm5\))
( 5 - x ) = -( 5 - x ) = -5 + x = x - 5
<=> \(\frac{5}{x+5}-\frac{x-3}{x-5}=\frac{2x-40}{\left(x+5\right)\left(x-5\right)}\)
<=> \(\frac{5\left(x-5\right)}{\left(x+5\right)\left(x-5\right)}-\frac{\left(x+5\right)\left(x-3\right)}{\left(x+5\right)\left(x-5\right)}=\frac{2x-40}{\left(x+5\right)\left(x-5\right)}\)
<=> \(5x-25-x^2+2x-15=2x-40\)
<=> \(5x-x^2+2x-2x=-40+25+15\)
<=> \(5x-x^2=0\)
<=> \(x^2-5x=0\)
<=> \(x\left(x-5\right)=0\)
<=> x = 0 ( nhận ) hoặc x = 5 ( loại do đkxđ )
Vậy nghiệm của phương trình là x = 0
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