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Calculati : (-2+19-9) - ( -13-8+12)= ??

Răspuns :

(-2+19-9)-(-13-8+12)=
(+17-9)-(-5+12)=
+8+5+12=
+13+12=+25
(-2+19-9) - (-13-8+12)
=(17-9) - (-21+12)
= 8-9
= -1