Question

afla valorile lui x,y,z, stiind ca; x+y=142; y+z=90, x+z=156.  Astept raspunsurile voastre.

Answer 1

x+y=142;=>y=142-x
 y+z=90=>z=90-y
x+z=156
x+90-y=156
x+90-142+x=156
2x-52=156
2x=208
x=104
y=142-104
y=38
z=90-38
z=52