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daca: a+b+c=495. a+b=410. b+c=320. atunci a=? b=? c=?

Răspuns :

a+b+c=495
a+b=410
b+c=320
a=495-320
a=175
b=410-175
b=235
c=320-235
c=85
495-410=85 ( c )
a+b+c=495
a+b+95=495
495-320= 175 ( a )
175+85=250 ( a+b )
495-250= 245 ( b )