afla nr necunoscut 245+x=888. y+235=434 . z-369=128 . 122+323-a=115.c-222=321+103

Răspuns :

x=888-245 = 643
y = 199
z = 497
a = 560
c = 646
×=888-245=643
y=434-235=199
z=369+128=497
447-a=115
a=447-115=332
c-222=424
c=222+424=646