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Afla numerele necunoscute:a) 245+*=888;y+235=434;z-369=128

Răspuns :

245+*=888
*=888-285
*=643

y+235=434
y=434-253
y=181

z-369=128
z=369+128
z=497
245+*=888
*=888-245
*=648

y+235=434
y=434-235
y=210

z-369=128
z=128+369
z=497