zadania znajdują się w załaczniku jest to zadanie 2 . przykład a , e i f oraz zadanie 3 przykład c i d
2.
a) 15 / (3 - x) = 7 / x
15x = 21 - 7x
22x = 21
x = 21/22
e) 4/ (x - 1) = 5 / (2x - 2)
8x - 8 = 5x - 5
3x = 3
x = 1
f) x / (x - 1) = (x+1) /(x+3)
x^2 + 3x = x^2 - 1
3x = -1
x = - 1/3
3.
c) 1,3x = 0,5 * (x + 20)
1,3x = 0,5x +10
0,8x = 10
x = 12,5
d) (x +5) / 4 = 2x / 6
8x = 6x + 30
2x = 30
x = 15
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2.
a) 15 / (3 - x) = 7 / x
15x = 21 - 7x
22x = 21
x = 21/22
e) 4/ (x - 1) = 5 / (2x - 2)
8x - 8 = 5x - 5
3x = 3
x = 1
f) x / (x - 1) = (x+1) /(x+3)
x^2 + 3x = x^2 - 1
3x = -1
x = - 1/3
3.
c) 1,3x = 0,5 * (x + 20)
1,3x = 0,5x +10
0,8x = 10
x = 12,5
d) (x +5) / 4 = 2x / 6
8x = 6x + 30
2x = 30
x = 15