Odpowiedzi

2010-03-29T20:47:27+02:00
A) 2x - 1,5x - 1 = 7/4 - x
2x - 1,5x + x = 7/4 + 1
1,5x = 1 7/4 / : 1,5
x = 1,75 : 1,5
x= 1,1(6)

b)3x - 2 + 4x = 1,5x + 0,75
3x + 4x - 1,5x = 0,75 +2
5,5x = 2,75 / : 5,5
x= 0,5

c) 3 1/3x + 8 = 4 2/5x - 8
3 1/3x - 4 2/5x = -8 - 8
3 5/15x - 4 6/15x = -16
2 20/15x - 4 6/15x = -16
-2 14/15x = -16 / : -1 14/15
x = 16 * 15/29
x= 240/29
x= 8 8/29