Ai giúp mình làm câu này với 2x-3=x+1\2
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LT
1
NV
Nguyễn Việt Lâm
Giáo viên
18 tháng 8 2021
ĐKXĐ: \(x\ge\dfrac{2}{3}\)
\(\Leftrightarrow x\sqrt{3x-2}-x^2+\left(x+1\right)\sqrt{5x-1}-\left(x+1\right)^2+x^2+\left(x+1\right)^2-8x+3=0\)
\(\Leftrightarrow x\left(\sqrt{3x-2}-x\right)+\left(x+1\right)\left(\sqrt{5x-1}-x-1\right)+2\left(x^2-3x+2\right)=0\)
\(\Leftrightarrow\dfrac{-x\left(x^2-3x+2\right)}{\sqrt{3x-2}+x}+\dfrac{-\left(x+1\right)\left(x^2-3x+2\right)}{\sqrt{5x-1}+x+1}+2\left(x^2-3x+2\right)=0\)
\(\Leftrightarrow\left(x^2-3x+2\right)+\left(2-\dfrac{x}{\sqrt{3x-2}+x}-\dfrac{x+1}{\sqrt{5x-1}+x+1}\right)=0\)
\(\Leftrightarrow\left(x^2-3x+2\right)\left(\dfrac{\sqrt{3x-2}}{\sqrt{3x-2}+x}+\dfrac{\sqrt{5x-1}}{\sqrt{5x-1}+x+1}\right)=0\)
\(\Leftrightarrow x^2-3x+2=0\) (ngoặc đằng sau luôn dương)
\(\Leftrightarrow...\)
XO
16 tháng 8 2020
Ta có : \(\frac{2x+5}{x+1}=\frac{2x+2+3}{x+1}=\frac{2\left(x+1\right)+3}{x+1}=2+\frac{3}{x+1}\)
Vì 2 \(\inℤ\Rightarrow\frac{3}{x+1}\inℤ\Rightarrow3⋮x+1\Rightarrow x+1\inƯ\left(3\right)\Rightarrow x+1\in\left\{1;3;-1;-3\right\}\)
=> \(x\in\left\{0;2-2;-4\right\}\)
Để \(\frac{3x-1}{2x-1}\inℤ\Rightarrow3x-1⋮2x-1\Rightarrow2\left(3x-1\right)⋮2x-1\Rightarrow6x-2⋮2x-1\)
=> \(6x-3+1⋮2x-1\Rightarrow3\left(2x-1\right)+1⋮2x-1\)
Vì \(3\left(2x-1\right)⋮2x-1\)
=> \(1⋮2x-1\Rightarrow2x-1\inƯ\left(1\right)\Rightarrow2x-1\in\left\{1;-1\right\}\Rightarrow x\in\left\{1;0\right\}\)
16 tháng 8 2020
\(\frac{2x+5}{x+1}=\frac{2\left(x+1\right)+3}{x+1}=2+\frac{3}{x+1}\)
Để phân số nguyên => \(\frac{3}{x+1}\)nguyên
=> \(3⋮x+1\)
=> \(x+1\inƯ\left(3\right)=\left\{\pm1;\pm3\right\}\)
=> \(x=\left\{0;-2;2;-4\right\}\)
\(\frac{3x-1}{2x-1}\)
Để phân số nguyên => \(3x-1⋮2x-1\)
=> \(2\left(3x-1\right)⋮2x-1\)
=> \(6x-2⋮2x-1\)
\(\Rightarrow3\left(2x-1\right)+1⋮2x-1\)
\(\Rightarrow1⋮2x-1\)
\(\Rightarrow2x-1\inƯ\left(1\right)=\left\{\pm1\right\}\)
\(\Rightarrow x=\left\{1;0\right\}\)
19 tháng 1 2022
Câu 1:
\(\left(x-2\right)\left(x^2+2x+4\right)+25x=x\left(x+5\right)\left(x-5\right)+8\)
\(\Leftrightarrow x^3-8+25x=x\left(x^2-25\right)+8\)
\(\Leftrightarrow x^3-8+25x=x^3-25x+8\)
\(\Leftrightarrow x^3-8+25x-x^3+25x-8=0\)
\(\Leftrightarrow50x-16=0\)
\(\Leftrightarrow50x=16\)
\(\Leftrightarrow x=\dfrac{8}{25}\)
B
19 tháng 1 2022
Câu 2 :
\(\dfrac{x+5}{4}+\dfrac{3+2x}{3}=\dfrac{6x-1}{3}-\dfrac{1-2x}{12}\)
<=> \(\dfrac{3\left(x+5\right)}{12}+\dfrac{4\left(3+2x\right)}{12}=\dfrac{4\left(6x-1\right)}{12}-\dfrac{1-2x}{12}\)
<=>\(\dfrac{3x+15+12+8x}{12}=\dfrac{24x-4-1+2x}{12}\)
<=> 3x + 15 + 12 + 8x = 24x - 4 - 1 +2x
<=> 11x+27 = 26x -5
<=> ( 26x - 5 ) - ( 11x + 27 ) = 0
<=> 15x - 32 = 0
<=> 15x = 32
<=> x = \(\dfrac{32}{15}\)
H
29 tháng 3 2023
`1/2 xx 1/3 xx 1/4`
`= (1xx1xx1)/(2xx3xx4)`
`= 1/24`
__
`1/2 xx 1/3 : 1/4`
`= 1/2 xx 1/3 xx 4`
`= (1xx1xx4)/(2xx3)`
`= 4/6`
`=2/3`
__
`1/2 : 1/3 xx1/4`
`= 1/2 xx 3 xx 1/4`
`=(1xx3xx1)/(2xx4)`
`= 3/8`
__
`1/2 : 1/3 : 1/4`
`= 1/2 xx 3xx4`
`= 12/2`
`=6`
NH
29 tháng 3 2023
`1/2xx1/3xx1/4`
`=1/24`
`1/2xx1/3:1/4`
`=1/6xx4`
`=4/6=2/3`
`1/2:1/3xx1/4`
`=1/2xx3xx1/4`
`=3/2xx1/4`
`=3/8`
`1/2:1/3:1/4`
`=1/2xx3xx4`
`=6`
23 tháng 9 2018
Hình như bạn nhập sai đề bài rùi , thôi mik sửa theo cách mik thử
Nếu \(\left(\frac{1}{2}\right)^{2x}+1=\frac{1}{8}\)
Ta có: \(\left(\frac{1}{2}\right)^{2x}=-\frac{7}{8}\)
mà \(\left(\frac{1}{2}\right)^{2x}\ge0\forall x;-\frac{7}{8}< 0\)
\(\Rightarrow2x\in\varnothing\Rightarrow x\in\varnothing\)
5 tháng 3 2022
c: \(=\dfrac{1}{3x-2}-\dfrac{4}{3x+2}+\dfrac{3x-6}{\left(3x-2\right)\left(3x+2\right)}\)
\(=\dfrac{3x+2-12x+8+3x-6}{\left(3x-2\right)\left(3x+2\right)}\)
\(=\dfrac{-6x+4}{\left(3x-2\right)\left(3x+2\right)}=\dfrac{-2}{3x+2}\)
d: \(=\dfrac{x^2-4-x^2+10}{x+2}=\dfrac{6}{x+2}\)
e: \(=\dfrac{1}{2\left(x-y\right)}-\dfrac{1}{2\left(x+y\right)}-\dfrac{y}{\left(x-y\right)\left(x+y\right)}\)
\(=\dfrac{x+y-x+y-2y}{2\left(x-y\right)\left(x+y\right)}=\dfrac{0}{2\left(x-y\right)\left(x+y\right)}=0\)
DL
1
15 tháng 11 2021
\(\Leftrightarrow x^3+3x^2+3x+1-x^3+1-2=0\)
\(\Leftrightarrow3x^2+3x=0\)
\(\Leftrightarrow\left[{}\begin{matrix}x=0\\x=-1\end{matrix}\right.\)
hộ mình với
\(2x-3=\frac{x+1}{2}\)
\(\Rightarrow2\left(2x-3\right)=x+1\)
\(\Rightarrow4x-6=x+1\)
\(\Rightarrow3x=7\)
\(\Rightarrow x=\frac{7}{3}\)