Question

Aflați x daca a+b=8 a)x+2a+ab=20; b)5a+5b-x=12; c) x+6=23+7a+7b repede va rog dau coroana

Answer 1

a + b = 8

a)  x + 2 a + 2 b = 20

x + 2 ( a + b ) = 20

x + 2 · 8 = 20

x = 20 - 16

x = 4

_______________________

b)  5 a + 5 b - x = 12

5 ( a + b ) - x = 12

5 × 8 - x = 12

40 - x = 12

x = 40 - 12 ⇒   x = 28

___________________

c)   x + 6 = 23 + 7 a + 7 b

x + 6 = 23 + 7 ( a + b )

x = 23 - 6 + 7 × 8

x = 17 + 56

x = 73