<=> -x² -2x = 0

<=> -x.(x+2)=0

<=> x= 0; x= -2

<=> x = 13 x 35/91

<=> x = 5

a, \(\dfrac{1}{2}\)

b, \(\dfrac{6}{17}\)

7 quả

<=> 6x² - 12x - 6x² - 30x = x-1

<=> -32x = x-1 

<=> -33x=-1

<=> x=\(\dfrac{1}{33}\)

=5/4

47

= 125 x 8 x 4 x 25 x 5

= 1000 x 100 x 5

= 500000

= 5¹⁹

<=> x².( x - 1 ) = ( 2x - 2 )²

<=> x².(x-1)=2.(x-1)(2x-2)

<=> (x-1).(x²-4x+4)=0

<=> (x-1).(x-2)²<=> x=1; x=2