Question

Daca x ori y = 20 si x ori z = 8 calculati : x(y+z) si y(y-z)

va imploooooor dau 15 p + un multumesc + cel mai bun raspuns

Answer 1

x*y=20
x*z=8
x(y+z)=?
x(y-z)=?

x(y+z)=
=x*y+x*z=
=20+8=28

x(y-z)=
=x*y-x*z=
=20-8=12

Answer 2

X×Y=20
X×Z= 8
X(Y+Z)=X×Y+X×Z
           = 20+8=28
........................................
X(Y-Z)=X×Y-X×Z
          = 20-8=12