Question

(Daca se poate si explicatie)
Dacă x = 5 și a + b = 13, calculați:

a) 3 ⋅ x + 7 ⋅ a + 7 ⋅ b ;

c) 10 ⋅ x + (4 ⋅ a + 4 ⋅ b) ;b) x ⋅ a + x ⋅ b– 50 ;

d) (4 ⋅ a + 4 ⋅ b– 2 ⋅ x) ⋅ (2 ⋅ a + 2 ⋅ b + x).
Va rog rapid

Answer 1

Răspuns:

Bună, sper ca te am ajutat!!!!!!

Answer 2

Răspuns:

Explicație pas cu pas:

x = 5

a + b = 13

a) 3 • x + 7 • a + 7 x b =
3 • x + 7 • (a+ b) =
3 • 5 + 7 • 13=
15 + 91 =
= 106

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

= 15

c) 10 • x + ( 4 • a + 4 • b) =
10 • x + 4 • ( a + b) =
10 • 5 + 4 • 13 =

59 + 52 =
= 102

d) ( 4 • a + 4 •b - 2 • x) •( 2•a+2•b+x)=
4 •( a +b) - 2 • x •2 •(a+b) + x =
( 4 • 13 - 2 • 5 ) • ( 2 • 13 + 5)=
( 52 - 10 ) • ( 26 + 5) =
42 • 31 =
= 1302