H7
1
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
Các câu hỏi dưới đây có thể giống với câu hỏi trên
22 tháng 7 2017
a) \(\left(\dfrac{3x}{1-3x}+\dfrac{2x}{3x+1}\right):\dfrac{6x^2+10x}{9x^2-6x+1}\)
\(=-\dfrac{9x^2+3x+2x-6x^2}{\left(3x-1\right)\left(3x+1\right)}.\dfrac{\left(3x-1\right)^2}{2x\left(3x+5\right)}\)
\(=-\dfrac{x\left(3x+5\right)}{\left(3x-1\right)^2}.\dfrac{\left(3x-1\right)^2}{2x\left(3x+5\right)}\)
\(=\dfrac{-1}{2}\)
b) \(\left(\dfrac{9}{x^3-9x}+\dfrac{1}{x+3}\right):\left(\dfrac{x-3}{x^2+3x}-\dfrac{x}{3x+9}\right)\)
\(=\left(\dfrac{9+x^2-3x}{x\left(x-3\right)\left(x+3\right)}\right):\left(\dfrac{3x-9-x^2}{3x\left(x+3\right)}\right)\)
\(=\dfrac{x^2-3x+9}{x\left(x-3\right)\left(x+3\right)}.\dfrac{3x\left(x+3\right)}{-x^2+3x-9}\)
\(=\dfrac{x^2-3x+9}{x-3}.\dfrac{3}{-\left(x^2-3x+9\right)}\)
\(=-\dfrac{3}{x-3}\)
18 tháng 4 2017
1.
\(\dfrac{7x-3}{x-1}=\dfrac{2}{3}\left(ĐKXĐ:x\ne1\right)\\ \Leftrightarrow3\left(7x-3\right)=2\left(x-1\right)\\ \Leftrightarrow21x-9=2x-2\\ \Leftrightarrow19x=7\\ \Leftrightarrow x=\dfrac{7}{19}\left(TMĐK\right)\)
2.
\(\dfrac{5x-1}{3x+2}=\dfrac{5x-7}{3x-1}\left(ĐKXĐ:x\ne-\dfrac{2}{3};x\ne\dfrac{1}{3}\right)\\ \Leftrightarrow\left(5x-1\right)\left(3x-1\right)=\left(5x-7\right)\left(3x+2\right)\\ \Leftrightarrow15x^2-5x-3x+1=15x^2+10x-21x-14\\ \Leftrightarrow-8x+1=-11x-14\\ \Leftrightarrow3x=-15\\ \Leftrightarrow x=-5\left(TMĐK\right)\)
3.
\(\dfrac{1-x}{x+1}+3=\dfrac{2x+3}{x+1}\left(ĐKXĐ:x\ne-1\right)\\ \Leftrightarrow\left(\dfrac{1-x}{x+1}+3\right)\left(x+1\right)=2x+3\\ \Leftrightarrow\dfrac{1-x+3\left(x+1\right)}{x+1}.\left(x+1\right)=2x+3\\ \Leftrightarrow\dfrac{4+2x}{x+1}\left(x+1\right)=2x+3\\ \Leftrightarrow4+2x=2x+3\\ \Leftrightarrow4=3\)
Vô nghiệm.
TQ
17 tháng 7 2017
a,\(\dfrac{3}{x-3}\) - \(\dfrac{6x}{9-x^2}\) + \(\dfrac{x}{x+3}\) (*)
đkxđ: x khác 3, x khác -3
(*) \(\dfrac{3(x+3)}{\left(x-3\right).\left(x+3\right)}\)- \(\dfrac{6x}{\left(x-3\right).\left(x+3\right)}\) + \(\dfrac{x\left(x+3\right)}{\left(x-3\right).\left(x+3\right)}\)
=>3x+9 -6x + x2+3x
<=>x2 + 3x-6x+3x + 9
<=>x2 +9
<=>(x-3).(x+3)
8 tháng 12 2017
\(\dfrac{1}{3x-2}\)+ \(\dfrac{-1}{3x+2}\) +\(\dfrac{3x-6}{\left(3x\right)^2-2^2}\)
\(\dfrac{1}{3x-2}\) + \(\dfrac{-1}{3x+2}\) +\(\dfrac{3\left(x-2\right)}{\left(3x-2\right)\left(3x+2\right)}\)
\(\dfrac{3x+2}{\left(3x-2\right)\left(3x+2\right)}\) + \(\dfrac{-\left(3x-2\right)}{\left(3x-2\right)\left(3x+2\right)}\) + \(\dfrac{3\left(x-2\right)}{\left(3x-2\right)\left(3x+2\right)}\)
\(\dfrac{3x+2-3x+2+3\left(x+2\right)}{\left(3x-2\right)\left(3x+2\right)}\) = \(\dfrac{3\left(x+2\right)+4}{\left(3x-2\right)\left(3x+2\right)}\)
NT
1
NL
1
ND
1 tháng 6 2018
\(\left(\dfrac{3x}{1-3x}+\dfrac{2x}{3x+1}\right):\dfrac{6x^2+10x}{1-6x+9x^2}\)\(\left(ĐKXĐ:x\ne\pm\dfrac{1}{3}\right)\)
\(=\left[\dfrac{-3x\left(3x+1\right)+2x\left(3x-1\right)}{\left(3x-1\right)\left(3x+1\right)}\right]:\dfrac{2x\left(3x+5\right)}{\left(3x-1\right)^2}\)
\(=\dfrac{-9x^2-3x+6x^2-2x}{\left(3x-1\right)\left(3x+1\right)}.\dfrac{\left(3x-1\right)^2}{2x\left(3x+5\right)}\)
\(=\dfrac{-3x^2-5x}{\left(3x-1\right)\left(3x+1\right)}.\dfrac{\left(3x-1\right)^2}{2x\left(3x+5\right)}\)
\(=\dfrac{-x\left(3x+5\right).\left(3x-1\right)^2}{\left(3x-1\right)\left(3x+1\right).2x\left(3x+5\right)}\)
\(=\dfrac{1-3x}{2\left(3x+1\right)}\)
\(=\dfrac{1-3x}{6x+2}\)
NT
2
TA
2 tháng 2 2018
DK: x≠ 1/3,-1/3
pt<=> \(\dfrac{12}{\left(1-3x\right)\left(1+3x\right)}=\dfrac{\left(1-3x\right)^2}{\left(1-3x\right)\left(1+x\right)}-\dfrac{\left(1+3x\right)^2}{\left(1-3x\right)\left(1+3x\right)}\)
=> 12=(1-3x)2-(1+3x)2=(1-3x-1-3x)(1-3x+1+3x)
=(-6x).2=-12x
=> x=-1
2 tháng 2 2018
\(\text{Đ}KX\text{Đ}:\left[{}\begin{matrix}1-9x^2\ne0\\1+3x\ne0\\1-3x\ne0\end{matrix}\right.=>\left[{}\begin{matrix}x\ne\dfrac{-1}{3}\\x\ne\dfrac{1}{3}\end{matrix}\right.\)
\(\dfrac{12}{1-9x^2}=\dfrac{1-3x}{1+3x}-\dfrac{1+3x}{1-3x}\left(1\right)\)
\(\left(1\right)=>\dfrac{12}{\left(1-3x\right)\left(1+3x\right)}-\dfrac{\left(1-3x\right)\left(1-3x\right)}{\left(1-3x\right)\left(1+3x\right)}+\dfrac{\left(1+3x\right)\left(1+3x\right)}{\left(1-3x\right)\left(1+3x\right)}=0\)\(< =>12-\left(1-3x-3x+9x^2\right)+\left(1+3x+3x+9x^2\right)=0\)
\(< =>12-1+3x+3x-9x^2+1+3x+3x+9x^2=0\)
<=>12x+12=0
<=>12x=-12
<=>x=-1(nhận)
\(S=\left\{-1\right\}\)
7 tháng 6 2022
Bài 2:
Vì x<0
nên x<1
=>|x-1|+|x|+x=1-x-x+x=-x+1
\(M=\dfrac{-x+1}{3x^2-4x+1}=\dfrac{-\left(x-1\right)}{\left(3x-1\right)\left(x-1\right)}=\dfrac{-1}{3x-1}\)
DD
2
27 tháng 7 2018
\(ĐKXĐ:1-3x\ne0\Leftrightarrow x\ne\dfrac{1}{3};3x+1\ne0\Leftrightarrow x\ne-\dfrac{1}{3}\)
\(A=\left(\dfrac{3x}{1-3x}+\dfrac{2x}{3x+1}\right):\dfrac{6x^2+10x}{1-6x+9x}\)
\(A=\left(\dfrac{9x^2+3x+2x-6x^2}{\left(1-3x\right)\left(3x+1\right)}\right):\left(\dfrac{6x^2+10x}{1+3x}\right)\)
\(A=\dfrac{3x^2+5x}{3x+1-9x^2-3x}.\dfrac{1+3x}{6x^2+10}\)
\(A=\dfrac{\left(3x^2+5x\right).\left(1+3x\right)}{\left(1-9x^2\right).2.\left(3x^2+5\right)}\)
\(A=\dfrac{1+3x}{\left(1+3x\right)\left(1-3x\right)}=\dfrac{1}{\left(1-3x\right).2}=\dfrac{1}{2-6x}\)
27 tháng 7 2018
Hình như đề bị thiếu mũ \(2\) trong \(1-6x+9x\)\(\) đúng không Đinh Diệp
\(A=\left(\dfrac{3x}{1-3x}+\dfrac{2x}{3x+1}\right):\dfrac{6x^2+10x}{1-6x+9x^2}\)
\(A=\left(\dfrac{3x\left(1+3x\right)}{\left(1-3x\right)\left(1+3x\right)}+\dfrac{2x\left(1-3x\right)}{\left(1+3x\right)\left(1-3x\right)}\right):\dfrac{2x\left(3x+5\right)}{\left(3x-1\right)^2}\)
\(A=\left[\dfrac{3x\left(1+3x\right)}{\left(1-3x\right)\left(1+3x\right)}+\dfrac{2x\left(1-3x\right)}{\left(1+3x\right)\left(1-3x\right)}\right]:\dfrac{2x\left(3x+5\right)}{\left(3x-1\right)^2}\)
\(A=\left[\dfrac{3x+9x^2}{\left(1-3x\right)\left(1+3x\right)}+\dfrac{2x-6x^2}{\left(1+3x\right)\left(1-3x\right)}\right]:\dfrac{2x\left(3x+5\right)}{\left(3x-1\right)^2}\)
\(A=\left[\dfrac{3x+9x^2+2x-6x^2}{\left(1-3x\right)\left(1+3x\right)}\right].\dfrac{\left(3x-1\right)^2}{2x\left(3x+5\right)}\)
\(A=\left[\dfrac{3x^2+5x}{-\left(3x-1\right)\left(1+3x\right)}\right].\dfrac{\left(3x-1\right)^2}{2x\left(3x+5\right)}\)
\(A=\left[\dfrac{x\left(3x+5\right)}{-\left(3x-1\right)\left(1+3x\right)}\right].\dfrac{\left(3x-1\right)^2}{2x\left(3x+5\right)}\)
\(A=\dfrac{1}{-\left(1+3x\right)}.\dfrac{3x-1}{x}\)
\(A=\dfrac{1}{-1-3x}.\dfrac{3x-1}{x}\)
\(A=\dfrac{3x-1}{-x-3x^2}\)
\(\dfrac{1}{1+3x}-\dfrac{3x}{9x^2-1}=\dfrac{1}{3x+1}-\dfrac{3x}{\left(3x-1\right)\left(3x+1\right)}\)
\(=\dfrac{3x-1}{\left(3x-1\right)\left(3x+1\right)}-\dfrac{3x}{\left(3x-1\right)\left(3x+1\right)}\)
\(=\dfrac{-1}{\left(3x-1\right)\left(3x+1\right)}=\dfrac{-1}{9x^2-1}\)