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1. Restrângeti termenii:
a) 5/3+7/3-9/3 -(6/3–12/3 +10/3);
b) 15/5–16/5 +12/5 - (26/5–18/5–13/5);
c)-23/11 +14/11 (-17/11 +8/11 – 9/11)-(-15/11+ 23/11);
d) 27/6-12/6 – 24/6 -(25/6-13/6-7/6)-(-16/6 +13/6)​