Răspuns:
Explicație pas cu pas:
a)
IxI = 3
x1 = 3
x2 = -3
e)
Ix - 1I = 11
x - 1 = 11
x = 11 + 1 = 12
-----
x - 1 = -11
x = -11 + 1 = -10
i)
I2x + 3I = 7
2x + 3 = 7
2x = 7 - 3 = 4
x = 4 : 2 = 2
-------
2x + 3 = -7
2x = -7 - 3 = -10
x = -10 : 2 = -5
l)
-17 + I-2x - 7I = -8
I-2x - 7I = -8 + 17 = 9
-2x - 7 = 9
2x = -7 - 9 = -16
x = -16 : 2 = -8
------
-2x - 7 = -9
2x = 9 - 7 = 2
x = 2 : 2 = 1
