a) 4/x = 5/9
x = 4 * 9 / 5 = 36 / 5 b) 9,36/7,2 = 1,3/x
x = 1,3 * 7,2 / 9,36 = 9,36/9,36 = 1 c) x - 5/7 = 3/5
x = 3/5 + 5/7 = 21/35 + 25/35 = 46/35 d) x/1,2 = 1,2/4
x = 1,2 * 1,2 / 4 = 1,44 / 4 = 0,36 e) 0,6/x = 0,8/6
x = 0,6 * 6 / 0,8 = 3,6 / 0,8 = 4,5 f) x/3 = x + 5/2
2/3x = -5/2
x = - 5/2 * 3/2 = -15/4 g) 3,2/2,8 = x/3,5
x = 3,2 * 3,5 / 2,8 = 4 h) x/0,6 = 6/0,8
x = 6 * 0,6 / 0,8 = 3,6 / 0,8 = 4,5 i) 4/(x + 6) = 5/(7 + x)
4(7 + x) = 5(x + 6)
5x + 30 = 28 + 4x
x = 2
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a)
4/x = 5/9
x = 4 * 9 / 5 = 36 / 5
b)
9,36/7,2 = 1,3/x
x = 1,3 * 7,2 / 9,36 = 9,36/9,36 = 1
c)
x - 5/7 = 3/5
x = 3/5 + 5/7 = 21/35 + 25/35 = 46/35
d)
x/1,2 = 1,2/4
x = 1,2 * 1,2 / 4 = 1,44 / 4 = 0,36
e)
0,6/x = 0,8/6
x = 0,6 * 6 / 0,8 = 3,6 / 0,8 = 4,5
f)
x/3 = x + 5/2
2/3x = -5/2
x = - 5/2 * 3/2 = -15/4
g)
3,2/2,8 = x/3,5
x = 3,2 * 3,5 / 2,8 = 4
h)
x/0,6 = 6/0,8
x = 6 * 0,6 / 0,8 = 3,6 / 0,8 = 4,5
i)
4/(x + 6) = 5/(7 + x)
4(7 + x) = 5(x + 6)
5x + 30 = 28 + 4x
x = 2