Question

va rog ajutatima

Dacă x = 5 și a + b = 13, calculați:

a) 3 ⋅ x + 7 ⋅ a + 7 ⋅ b ;
b) x ⋅ a + x ⋅ b– 50 ;
c) 10 ⋅ x + (4 ⋅ a + 4 ⋅ b) ;
d) (4 ⋅ a + 4 ⋅ b– 2 ⋅ x) ⋅ (2 ⋅ a + 2 ⋅ b + x).

Answer 1

a) 3*x+ 7*(a+b)=15+7*13=15+91=106

b) x*(a+b)-50=5*13-50=65-50=5

c)10*x+4*(a+b)=50+4*13=50+52=102

d)(4*(a+b)-2*x)*(2*(a+b)+x)=(4*13-10)*(2*13+15)=42*41=1722