Odpowiedzi

2010-03-08T18:10:51+01:00
A) 5 : (2x+3) = 3 : (2 - x) - x
2/5x + 3/5 = 2/3 - 1/3x - x
2/5x + 1/3x + x = 2/3 - 3/5
1 11/15x = 1/15 /: 1 11/15
x= 16/55

b) 2 : (x+1) - 3: (x-1) = 1/4
2x + 2 - 1/3x + 1/3 = 1/4
2x - 1/3x = 1/4 - 2 - 1/3
1 2/3x = 1 5/12 /: 1 2/3
x = 2 15/24

c) 2: (4x + 7) - 6: (5x - 1) = x + 5
1/2x + 2/7 - 1 1/5x + 6 = x +5
1/2x - 1 1/5x - x = 5 - 2/7 - 6
1 3/10x = -2 5/7 /: 1 3/10
x = 3 15/35