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7. Calculați:
a.(-1/2)-(-1/3)+[(-1/6)+(+1/12)]
b.(-5/12)-[(-1/2)+(+3/4)-(-1/6)]
c.(-7/36)+[(-2/9)+(-5/18)-(+1/2)]
d.(-8/9)-[-5/72-(-1/12)+(-11/36)]​