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a: \(=\dfrac{5\left(x+2\right)}{10xy^2}\cdot\dfrac{12x}{x+2}=\dfrac{60x}{10xy^2}=\dfrac{6}{y^2}\)

b: \(=\dfrac{x-4}{3x-1}\cdot\dfrac{3\left(3x-1\right)}{\left(x-4\right)\left(x+4\right)}=\dfrac{3}{x+4}\)

c: \(=\dfrac{2\left(2x+1\right)}{\left(x+4\right)^2}\cdot\dfrac{\left(x+4\right)}{3\left(x+3\right)}=\dfrac{2\left(2x+1\right)}{3\left(x+3\right)\left(x+4\right)}\)

d: \(=\dfrac{5\left(x-1\right)}{3\left(x+1\right)}\cdot\dfrac{x+1}{x-1}=\dfrac{5}{3}\)

d: \(\Leftrightarrow\dfrac{\left(x+2\right)^2}{\left(x+2\right)\left(x-2\right)}=\dfrac{\left(x+1\right)\left(x+2\right)}{A}\)

hay A=x-2

19 tháng 10 2021

\(a,=3x\left(y-z\right)-y\left(y-z\right)=\left(3x-y\right)\left(y-z\right)\\ b,=x^3\left(x-1\right)+x\left(x-1\right)=x\left(x^2+1\right)\left(x-1\right)\\ c,=x\left(y+z\right)+y\left(y+z\right)=\left(x+y\right)\left(y+z\right)\\ d,=\left(x-3\right)^2\\ e,=\left(x+2\right)^3\\ f,=\left(2x-x+y\right)\left(2x+x-y\right)=\left(x+y\right)\left(3x-y\right)\\ g,=\left(y+1\right)\left(5x-2\right)\\ h,=\left(x+2\right)^2\\ i,=x^2\left(x^2-2\right)\\ k,=3x\left(x-4y\right)\)

27 tháng 7 2023

chuyển vế sang r phân tích thành nhân tử, có thể dùng máy tính bỏ túi nhé bạn

 

27 tháng 7 2023

câu 1: 9\(x^2\) + 12\(x\) + 5  =11

           (3\(x\))2 + 2.3.\(x\) .2 + 22 + 1 = 11

           (3\(x\) + 2)2      =  11 - 1

             (3\(x\) + 2)2    = 10

               \(\left[{}\begin{matrix}3x+2=\sqrt{10}\\3x+2=-\sqrt{10}\end{matrix}\right.\)

                \(\left[{}\begin{matrix}3x=\sqrt{10}-2\\3x=-\sqrt{10}-2\end{matrix}\right.\)

                  \(\left[{}\begin{matrix}x=\dfrac{\sqrt{10}-2}{3}\\x=\dfrac{-\sqrt{10}-2}{3}\end{matrix}\right.\)

                 Vậy S = {\(\dfrac{-\sqrt{10}-2}{3}\); \(\dfrac{\sqrt{10}-2}{3}\)

  Câu 2: 6\(x^2\) + 16\(x\) + 12 = 2\(x^2\)

              6\(x^2\) + 16\(x\) + 12 - 2\(x^2\) = 0

              4\(x^2\) + 16\(x\) + 12 = 0

              (2\(x\))2 + 2.2.\(x\).4 + 16 - 4 = 0

               (2\(x\) + 4)2   = 4

               \(\left[{}\begin{matrix}2x+4=2\\2x+4=-2\end{matrix}\right.\) 

                \(\left[{}\begin{matrix}2x=-2\\2x=-6\end{matrix}\right.\)

                 \(\left[{}\begin{matrix}x=-1\\x=-3\end{matrix}\right.\)

              S = { -3; -1}

3, 16\(x^2\) + 22\(x\) + 11 = 6\(x\) + 5

    16\(x^2\) + 22\(x\) - 6\(x\)  + 11 - 5 = 0

     16\(x^2\) + 16\(x\) + 6 = 0

      (4\(x\))2 + 2.4.\(x\) . 2 + 22 + 2 = 0

       (4\(x\) + 2)2 + 2 = 0 (1) 

Vì (4\(x\)+ 2)2 ≥ 0 ∀ ⇒ (4\(x\) + 2)2 + 2 > 0 ∀ \(x\) vậy (1) Vô nghiệm

             S = \(\varnothing\)

Câu 4. 12\(x^2\) + 20\(x\) + 10 = 3\(x^2\) - 4\(x\) 

            12\(x^2\) + 20\(x\) + 10 - 3\(x^2\) + 4\(x\) = 0

            9\(x^2\) + 24\(x\) + 10 = 0

           (3\(x\))2 + 2.3.\(x\).4 + 16 - 6 = 0

          (3\(x\) + 4)2 = 6

            \(\left[{}\begin{matrix}3x+4=\sqrt{6}\\3x+4=-\sqrt{6}\end{matrix}\right.\)

              \(\left[{}\begin{matrix}3x=-4+\sqrt{6}\\3x=-4-\sqrt{6}\end{matrix}\right.\)

              \(\left[{}\begin{matrix}x=\dfrac{\sqrt{6}-4}{3}\\x=-\dfrac{\sqrt{6}+4}{3}\end{matrix}\right.\)

                    S = {\(\dfrac{-\sqrt{6}-4}{3}\)\(\dfrac{\sqrt{6}-4}{3}\)}

                     

            

1) Ta có: \(\left(x+5\right)\left(x+2\right)-3\left(4x-3\right)=\left(5-x\right)^2\)

\(\Leftrightarrow x^2+2x+5x+10-12x+9=25-10x+x^2\)

\(\Leftrightarrow x^2-5x+19-25+10x-x^2=0\)

\(\Leftrightarrow5x-6=0\)

\(\Leftrightarrow5x=6\)

\(\Leftrightarrow x=\frac{6}{5}\)

Vậy: \(x=\frac{6}{5}\)

2) Ta có: \(\left(x+2\right)^3-\left(x-2\right)^3=12x\left(x-1\right)-8\)

\(\Leftrightarrow x^3+6x^2+12x+8-\left(x^3-6x^2+12x-8\right)=12x^2-12x-8\)

\(\Leftrightarrow x^3+6x^2+12x+8-x^3+6x^2-12x+8-12x^2+12x+8=0\)

\(\Leftrightarrow12x+24=0\)

\(\Leftrightarrow12x=-24\)

\(\Leftrightarrow x=-2\)

Vậy: x=-2

3) Ta có: \(3x\left(12x-4\right)-9x\left(4x-3\right)=30\)

\(\Leftrightarrow36x^2-12x-36x^2+27x-30=0\)

\(\Leftrightarrow15x-30=0\)

\(\Leftrightarrow15x=30\)

\(\Leftrightarrow x=2\)

Vậy: x=2

4) Ta có: \(\left(12x-5\right)\left(4x-1\right)+\left(3x-7\right)\left(1-16x\right)=81\)

\(\Leftrightarrow48x^2-12x-20x+5+3x-48x^2-7+112x-81=0\)

\(\Leftrightarrow83x-83=0\)

\(\Leftrightarrow83x=83\)

\(\Leftrightarrow x=1\)

Vậy: x=1

31 tháng 10 2021
(3x-2)(2x-4)=1-12x²
6 tháng 8 2016

1.a) (4x - 6y)2 - (8xy - 5)2 = (4x - 6y - 8xy + 5)(4x - 6y + 8xy - 5)

   b) 16x2 - 49y2 = (4x)2 - (7y)2 = (4x - 7y)(4x + 7y)

   c) 36x2 + 60x + 25 = (6x)2 + 2.6x.5 + 52 = (6x + 5)2

   d) (2x - y)(x - y) - (3y - 4x)2 + (y - 2x)(2y - 3x) = (y - 2x)(y - x) + (y - 2x)(2y - 3x) - (3y - 4x)2

     = (y - 2x)[(y - x) + (2y - 3x)] - (3y - 4x)2 = (y - 2x)(3y - 4x) - (3y - 4x)2 = (3y - 4x)[(y - 2x) - (3y - 4x)] = 2(3y - 4x)(x - y)

2.M = (3x - 4)(9x2 - 12x + 16) + (6x - 8)2 = (3x - 4)[(3x)2 - 2.3x.4 + 42] + [2(3x - 4)]2 = (3x - 4)(3x - 4)2 + 4(3x - 4)2

       = (3x - 4)2(3x - 4 + 4) = 3x(3x - 4)2

6 tháng 8 2016

a) =(4x-6y-8xy+3)(4x-6y+8xy-3)

=[4x(1-2y)+3(1-2y)][4x(1+2y)-3(1+2y)]

=(4x+3)(4x-3)(1-2y)(1+2y)