Question

Rozwiąż równania !!! Na jutro !!! a)2(4-x)=5(x-1)-1 b)2x(x-1)-5=-5=3(2x-3)-8x c)x(x-2)-(xdo2-2x-3)=3(2-x)

Answer 1

a)2(4-x)=5(x-1)-1

8 - 2x = 5x - 5 - 1

-5x -2x=-8-5-1

-7x= - 14 / : (-7)

x = 2

 

b)2x(x-1)-5=-5=3(2x-3)-8x

2xkwadrat - 2x - 5 = 6x - 9 - 8x

2xkwadrat = 2x + 6x - 8x +5 - 9

2xkwadrat= -4 / " 2

xkwadrat = -2

 

c)x(x-2)-(xkwadrat-2x-3)=3(2-x)

xkwadrat - 2x - xkwadrat + 2x - 3 = 6 - 3x

-3 = 6 -3x

3x= 9 / : 3

x = 3