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Aflati numerele x, y si z , stiind ca : x+y=z; x-y=y; y+z=16


Răspuns :

x + y = z
x - y = y
le adunam
2x = y + z
y + z = 16
deci, 2x = 16
x = 16 : 2
x = 8
8 - y = y
2y = 8
y = 4
8 + 4 = z
z = 12
x-y=y
x=2y
x+y=z
2y+y=z
z=3y
y+z=16
y+3y=16
4y=16
y=16:4
y=4
x=4*2
x=8
z=4*3
z=12