19. * + 3x - 5x = x
* - 2x = x
* = 3x C.
20. 4a-2 + 2a +2 = 6a 1Fałsz
(6x*3)/2 = 9x 2Prawda
21. a) 12x + 2 b) 2,9a - 0,8 c) 3y - 1
22. obwód trójkąta = a+a+2+a+3 = 3a+5 obwód prostokąta = 2b+2b+b+b = 6b
23. a) -2x + 7 b) 4x - 3 ===> (-2x - 3) = 2x
c)
d) 1,2x
24 k-5 = 22 D.
25
a) x+7 = 52 x= 46
b) 3x = 69 x = 23
c) x - 5 = 11,7 x = 16,7
26 szalik => n+3 = 40
numery 3n + n = 60
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19. * + 3x - 5x = x
* - 2x = x
* = 3x C.
20. 4a-2 + 2a +2 = 6a 1Fałsz
(6x*3)/2 = 9x 2Prawda
21. a) 12x + 2 b) 2,9a - 0,8 c) 3y - 1
22. obwód trójkąta = a+a+2+a+3 = 3a+5 obwód prostokąta = 2b+2b+b+b = 6b
23. a) -2x + 7 b) 4x - 3 ===> (-2x - 3) = 2x
c)
d) 1,2x
24 k-5 = 22 D.
25
a) x+7 = 52 x= 46
b) 3x = 69 x = 23
c) x - 5 = 11,7 x = 16,7
26 szalik => n+3 = 40
numery 3n + n = 60