Odpowiedź :
Odpowiedź:
[tex]a)\\\\x-2(x-1)=0,2(1-2x)\\\\x-2x+2=0,2-0,4x\\\\-x+0,4x=0,2-2\\\\-0,6x=-1,8\ \ /:(-0,6)\\\\x=3\\\\\\b)\\\\2(5x-4)-5(x-3)=x-2(4-2x)\\\\10x-8-5x+15=x-8+4x\\\\5x+7=5x-8\\\\5x-5x=-8-7\\\\0=-15\\\\R\'ownanie\ \ sprzeczne\ \ nie\ \ ma\ \ rozwiazania[/tex]
[tex]c)\\\\x-5(2x-3(x+6))=-4(x-5)\\\\x-5(2x-3x-18)=-4x+20\\\\x-5(-x-18)=-4x+20\\\\x+5x+90=-4x+20\\\\6x+4x=20-90\\\\10x=-70\ \ /:10\\\\x=-7\\\\\\d)\\\\1\frac{3}{4}=2(x+2)+3(x+\frac{1}{4})\\\\\frac{7}{4}=2x+4+3x+\frac{3}{4}\\\\\frac{7}{4}=5x+\frac{19}{4}\ \ /\cdot4\\\\7=20x+19\\\\-20x=19-7\\\\-20x=12\ \ /:(-20)\\\\x=-\frac{12}{20}\\\\x=-\frac{3}{5}[/tex]
a) x - 2(x - 1) = 0,2(1 - 2x)
x - 2x + 2 = 0,2 - 0,4x
-x + 0,4x = 0,2 - 2
- 0,6x = 1,8
x = 3
b) 2(5x - 4) - 5(x - 3) = x - 2(4 - 2x)
10x - 8 - 5x + 15 = x - 8 + 4x
5x + 7 = 5x - 8
5x - 5x = -8 - 7
0 = - 15
równanie sprzeczne
c) x - 5(2x - 3(x + 6)) = -4(x - 5)
x - 5(2x - 3x - 18) = -4x + 20
x - 5(-x - 18) = - 4x + 20
x + 5x + 90 = -4x + 20
6x + 4x = - 70
10x = -70
x = -7
d) 1 3/4 = 2(x +2) + 3(x + 1/4)
7/4 = 2x + 4 + 3x + 3/4
7/4 - 3/4 - 4 = 5x
1 - 4 = 5x
5x = -3
x = -3/5