rozwiąż równania .!!!!!!!!!!!!!!!!! ;)))
a) x/2 = 2/5(4-x) -4
b) 2x-1/5 - x-2/2 = 0,7x
c) 2x- 3x + 5/4 = -1/4 x-1
/ - kreska ułamkowa . ;p
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a) x/2 = 2/5(4-x) -4 /*10
5x = 4(4-x) - 40
5x = 16 - 4x - 40
9x = -24
x = - 24/9
x = - 8/3
b) 2x-1/5 - x-2/2 = 0,7x /*10
20x - 2 - 5(x-2) = 7x
20x - 2 - 5x +10 = 7x
20x - 5x - 7x = 2 - 10
8x = -8
x = -1