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12. Calculați, folosind factorul comun:
a) -237-38-237.12;
b) -143-143-2-143-3-...-143.11;
c)-5-10-15-...-45;
d) -12-12-34+12.35;
e) -312-29-312-187+312-116;
f) -2021-2020+2020 2019+2.2018;
g)-2020-2021-2020+2022-2018;
h)-11-22-33-...-99.


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