Question

Scoateti mai intai factorul comun si apoi calculati;

2*a+2*b daca a+b=0
7*a-7*b daca a-b=130
3*a+3*b-3*c daca a+b-c=0
2*a+10*b daca a+5b=43

Answer 1

$2 \times a + 2 \times b = 2(a + b) = 2 \times 0 = 0$

$7 \times a - 7 \times b = 7(a - b) = 7 \times 130 = 910$

$3 \times a + 3 \times b - 3 \times c =3 (a + b - c) = 3 \times 0 = 0$

$2 \times a + 10 \times b = 2(a + 5b) = 2 \times 43 = 86$

Answer 2

2 × a + 2 × b   daca a + b = 0

2 × ( a + b ) = 2 × 0 = 0

_______________________

7 × a - 7 × b      daca  a - b = 130

7 × ( a - b ) = 7 × 130 = 910

________________________

3 × a + 3 × b - 3 × c     daca  a + b - c = 0

3 × ( a + b - c ) = 3 × 0 = 0

_________________________

2 × a + 10 × b     daca  a + 5 b = 43

2 × ( a + 5 b ) = 2 × 43 = 86