Question

daca x+y=3 calculati 3x+3y-2(x+y)+10​

Answer 1

Dam factor comun pe 3

3*(x+y) - 2(x+y) + 10

3*3 -2 * 3 + 10

9 - 6 + 10

3 + 10 = 13

Answer 2

Varianta 1:

3x+3y-2(x+y)+10=

=3(x+y)-2(x+y)+10=

=3·3-2·3+10=

=9-6+10=

=3+10=

=13

Varianta 2:

3x+3y-2(x+y)+10=

=3(x+y)-2(x+y)+10=

=(x+y)(3-2)+10=

=(x+y)·1+10=

=3+10=

=13

Varianta 3:

3x+3y-2(x+y)+10=

=3x+3y-2x-2y+10=

=x(3-2)+y(3-2)+10

=x+y+10=

=3+10=

=13