5/2-3/2x(x-2)=2
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tách 2,3 câu ra làm 1 câu hỏi đi. bạn đăng cả đóng thế này k ai tl cho đâu. khi nào tách thì gửi link mình tl cho
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1: =>x+1/2=0 hoặc 2/3-2x=0
=>x=-1/2 hoặc x=1/3
2: =>7/6x=5/2:3,75=2/3
=>x=2/3:7/6=2/3*6/7=12/21=4/7
3: =>2x-3=0 hoặc 6-2x=0
=>x=3 hoặc x=3/2
4: =>-5x-1-1/2x+1/3=3/2x-5/6
=>-11/2x-3/2x=-5/6-1/3+1
=>-7x=-1/6
=>x=1/42
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1: \(=6x^2+2x-15x-5-x^2+6x-9+4x^2+20x+25-27x^3-27x^2-9x-1\)
=-27x^3-18x^2+4x+10
2: =4x^2-1-6x^2-9x+4x+6-x^3+3x^2-3x+1+8x^3+36x^2+54x+27
=7x^3+37x^2+46x+33
5:
\(=25x^2-1-x^3-27-4x^2-16x-16-9x^2+24x-16+\left(2x-5\right)^3\)
\(=8x^3-60x^2+150-125+12x^2-x^3+8x-60\)
=7x^3-48x^2+8x-35
![](https://rs.olm.vn/images/avt/0.png?1311)
`a,x(x-1)-(x+2)^2=1`
`<=>x^2-x-x^2-4x-4=1`
`<=>-5x=5`
`<=>x=-1`
`b,(x+5)(x-3)-(x-2)^2=-1`
`<=>x^2+2x-15-x^2+4x-4+1=0`
`<=>6x-18=0`
`<=>x-3=0`
`<=>x=3`
`c,x(2x-4)-(x-2)(2x+3)=0`
`<=>2x(x-2)-(x-2)(2x+3)=0`
`<=>(x-2)(2x-2x-3)=0`
`<=>-3(x-2)=0`
`<=>x-2=0`
`<=>x=2`
`d,x(3x+2)+(x+1)^2-(2x-5)(2x+5)=-12`
`<=>3x^2+2x+x^2+2x+1-4x^2+25=-12`
`<=>4x+26=-12`
`<=>4x=-38`
`<=>x=-19/2`
![](https://rs.olm.vn/images/avt/0.png?1311)
a: Ta có: \(3\left(2x-3\right)+2\left(2-x\right)=-3\)
\(\Leftrightarrow6x-9+4-2x=-3\)
\(\Leftrightarrow4x=2\)
hay \(x=\dfrac{1}{2}\)
\(\dfrac{5}{2}\) - \(\dfrac{3}{2}\) \(\times\)(\(x\) - 2) = 2
\(\dfrac{3}{2}\) \(\times\)(\(x\) - 2) = \(\dfrac{5}{2}\) - 2
\(\dfrac{3}{2}\) \(\times\) (\(x\) - 2) = \(\dfrac{1}{2}\)
\(x\) - 2 = \(\dfrac{1}{2}\) : \(\dfrac{3}{2}\)
\(x\) - 2 = \(\dfrac{1}{3}\)
\(x\) = \(\dfrac{1}{3}\) + 2
\(x\) = \(\dfrac{7}{3}\)
\(\dfrac{5}{2}-\dfrac{3}{2}\cdot\left(x-2\right)=2\\ \Rightarrow\dfrac{5}{2}-\dfrac{3}{2}x+\dfrac{6}{2}=2\\ \Rightarrow\dfrac{5}{2}-\dfrac{3}{2}x=2-3\\ \Rightarrow\dfrac{5}{2}-\dfrac{3}{2}x=-1\\ \Rightarrow\dfrac{3}{2}x=\dfrac{5}{2}-\left(-1\right)\\ \Rightarrow\dfrac{3}{2}x=\dfrac{7}{2}\\ \Rightarrow x=\dfrac{7}{2}:\dfrac{3}{2}\\ \Rightarrow x=\dfrac{7}{3}\)