Răspuns:
1) 1 - a = 1 - 1/5 = 5/5 - 1/5 = 4/5 = 0,8
1 - b = 1 - 1/6 = 6/6 - 1 /6 = 5/6 = 0,83
-> 1 - a < 1 - b
2)a) 3 + 13 - 13 = 3
b)2 * | -7| + 7 * | -3|
= 2 * 7 + 7 * 3
14 + 21 = 35
c) (8/5 - 9/4) * ( 50 /14 - 65/14)
32/20 - 45/20 = -13/20
50/14 - 65/14 = -15/14
= 195 / 280 = 0,69
3) | x | = 7 -> x = +7 , -7
b) | x | = 10 -> x = +10 , -10
c) | x + 2 | = 5 -> x + 2 = 5 -> x = 3
x + 2 = -5 -> x = -7
d) | x - 1 | = 8
x-1 = 8 -> x = 9
x-1 = -8 -> x = -7
