Question

A egal cu 3 b plus c egal cu 5 Calculează. B plus c minus a. 4(a+1) 3(a+2)+4(a-1) 2a+4b+4c ab+ac

Answer 1

Răspuns:

Explicație pas cu pas:

a = 3    si   b + c = 5

________________

b + c - a = 5 - 3 = 2

______________

4( a + 1 ) + 3 ( a + 2 ) + 4 ( a - 1 ) = 39

= 4 × ( 3 + 1 ) + 3 × ( 3 + 2 ) + 4 × ( 3 - 1 ) =

= 4 × 4 + 3 × 5 + 4 × 2 =

= 16 + 15 + 8 =

= 39

_____________

2 a + 4 b + 4 c = 26

= 2 × 3 + 4 × ( b + c ) =

= 6 + 4 × 5 =

= 6 + 20 =

= 26

_____________________

a×b + a×c = a × ( b + c ) = 3 × 5 = 15