Question

1.Calculati: a) (1+2√2)-(3√2-7)-(8-√2)
b) (3-√5)+(√5-4)
2. Calculati: x+y+z; -x+y+z; x-y+z si x+y=z, daca x=√4 ; y=-√9; z=√49
E urgeeentttt, va rog frumos!!!!!

Answer 1

1.a) -14-2radical din 2
b)-1
2. 2-3+7=6;   -2-3+7=2;  2-(-3)+7=2+3+7=12;  (2-3=7)? sau multime vida