Răspuns :
1. 8 · (x + 5) = 72
x + 5 = 72 : 8
x + 5 = 9
x = 9 - 5
x = 4
2. -15 · (x + 6) = 120
x + 6 = 120 : (-15)
x + 6 = -8
x = -8 - 6
x = -14
3. -20 · (x - 3) = -180
x - 3 = -180 : (-20)
x - 3 = 9
x = 9 + 3
x = 12
/robèrtinni
x + 5 = 72 : 8
x + 5 = 9
x = 9 - 5
x = 4
2. -15 · (x + 6) = 120
x + 6 = 120 : (-15)
x + 6 = -8
x = -8 - 6
x = -14
3. -20 · (x - 3) = -180
x - 3 = -180 : (-20)
x - 3 = 9
x = 9 + 3
x = 12
/robèrtinni
1) 8x+40=72
8x=32, x=4
2)-15x-80=120
-15x=200, x=-13,3
3)-20x+60=-180
-20x=-240, x=12
8x=32, x=4
2)-15x-80=120
-15x=200, x=-13,3
3)-20x+60=-180
-20x=-240, x=12