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11 tháng 8 2022

`-6x-(-7)=2`

`-6x+7=2`

`-6x=2-7`

`-6x=-5`

`x=(-5):(-6)`

`x=5:6`

`x=5/6`

11 tháng 8 2022

-6x -(-7) =2

-6x +7 = 2

6x = 7-2

6x = 5

x = 5/6 

26 tháng 2 2018

\(\frac{2x-3}{\left(7-6x\right)^2}+\frac{x-2}{\left(7-6x\right)^2}=\frac{6x-3}{\left(3x-5\right)^2}-\frac{12x-10}{\left(3x-5\right)^2}\)

\(\Leftrightarrow\frac{2x-3+x-2}{\left(7-6x\right)^2}=\frac{6x-3-12x+10}{\left(3x-5\right)^2}\)

\(\Leftrightarrow\frac{3x-5}{\left(7-6x\right)^2}=\frac{7-6x}{\left(3x-5\right)^2}\)

\(\Leftrightarrow\left(7-6x\right)^3=\left(3x-5\right)^3\)

\(\Leftrightarrow7-6x=3x-5\)

\(\Leftrightarrow7+5=3x+6x\)

\(\Leftrightarrow12=9x\)

\(\Leftrightarrow x=\frac{4}{3}\)

Vậy \(x=\frac{4}{3}\)

19 tháng 9 2023

\(\dfrac{5}{4}-6x=7\dfrac{1}{2}\)

\(\dfrac{5}{4}-6x=\dfrac{15}{2}\)

\(6x=\dfrac{5}{4}-\dfrac{15}{2}\)

\(6x=-\dfrac{25}{4}\)

\(x=-\dfrac{25}{4}:6\)

\(x=\dfrac{-25}{24}\)

22 tháng 9 2018

* Trả lời:

\(\left(1\right)\) \(-3\left(1-2x\right)-4\left(1+3x\right)=-5x+5\)

\(\Leftrightarrow-3+6x-4-12x=-5x+5\)

\(\Leftrightarrow6x-12x+5x=3+4+5\)

\(\Leftrightarrow x=12\)

\(\left(2\right)\) \(3\left(2x-5\right)-6\left(1-4x\right)=-3x+7\)

\(\Leftrightarrow6x-15-6+24x=-3x+7\)

\(\Leftrightarrow6x+24x+3x=15+6+7\)

\(\Leftrightarrow33x=28\)

\(\Leftrightarrow x=\dfrac{28}{33}\)

\(\left(3\right)\) \(\left(1-3x\right)-2\left(3x-6\right)=-4x-5\)

\(\Leftrightarrow1-3x-6x+12=-4x-5\)

\(\Leftrightarrow-3x-6x+4x=-1-12-5\)

\(\Leftrightarrow-5x=-18\)

\(\Leftrightarrow x=\dfrac{18}{5}\)

\(\left(4\right)\) \(x\left(4x-3\right)-2x\left(2x-1\right)=5x-7\)

\(\Leftrightarrow4x^2-3x-4x^2+2x=5x-7\)

\(\Leftrightarrow-x-5x=-7\)

\(\Leftrightarrow-6x=-7\)

\(\Leftrightarrow x=\dfrac{7}{6}\)

\(\left(5\right)\) \(3x\left(2x-1\right)-6x\left(x+2\right)=-3x+4\)

\(\Leftrightarrow6x^2-3x-6x^2-12x=-3x+4\)

\(\Leftrightarrow-15x+3x=4\)

\(\Leftrightarrow-12x=4\)

\(\Leftrightarrow x=-\dfrac{1}{3}\)

4 tháng 8 2017

\(6x^2-\left(2x+5\right).\left(3x-2\right)=7\Leftrightarrow6x^2-\left(6x^2-4x+15x-10\right)=7\)

\(\Leftrightarrow6x^2-6x^2+4x-15x+10=7\Leftrightarrow4x-15x=7-10\)

\(\Leftrightarrow-11x=-3\Leftrightarrow x=\dfrac{-3}{-11}=\dfrac{3}{11}\) vậy \(x=\dfrac{3}{11}\)

4 tháng 8 2017

\(6x^2-\left(2x+5\right)\left(3x-2\right)=7\)

\(\Rightarrow6x^2-2x\left(3x-2\right)-5\left(3x-2\right)=7\)

\(\Rightarrow6x^2-6x^2+4x-15x+10=7\)

\(\Rightarrow-11x+10=7\)

\(\Rightarrow-11x=-3\)

\(\Rightarrow x=\dfrac{3}{11}\)

(x+7)(x^4-6x^3+2x^2-5)

=x^5-6x^4+2x^3-5x+7x^4-42x^3+14x^2-35

=x^5+x^4-40x^3+14x^2-5x-35

20 tháng 7 2023

\((x+7).(x^4-6x^3+2x^2-5)\)

`= x(x^4-6x^3+2x^2-5) + 7(x^4-6x^3+2x^2-5)`

`= x^5 - 6x^4 + 2x^3 - 5x + 7x^4 - 42x^3 + 14x^2 - 35`

`= x^5 + x^4 - 40x^3 + 14x^2 - 5x - 35`