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determinati valoare expresiei x-y+z daca:
a) x=-3, y=-7, z=-12
b) x=9, y=12, z=-8
c) x=-21, y=-6, z=17


Răspuns :

a) -3-7+(-12)
-3-19
-21
b) 9-12+(-8)
9-12-8
9-20
-11
c). -21-(-6)+17
-21+6+17
-21+23
+2