👤
a fost răspuns

Aflati x, daca a+b=8 : a)x+2a+2b ; b)5a+5b-x=12 ; c)x+6=23+7a+7b.

Răspuns :

Rapunzel15
a + b = 8

a) x + 2a+2b = x + 2×(a+b) = x + 2×8 = x + 16

b) 5a + 5b - x = 12
5×(a+b) - x = 12
5 × 8 - x = 12
40 - x = 12
x = 40 - 12
x = 28

c) x + 6 = 23 + 7a + 7b
x = 23 - 6 + 7 × (a+b)
x = 17 + 7 × 8
x = 17 + 56
x = 73

Alte intrebari