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comparati fractiile 1/2si1/3 5/2si7/2 2,13si2,1 2,(15)si2,1(5) 4/7si5/6 -3/4si-1/5 5/6si1/3 -7/3si-9/2 1/2si-1/3 -1.5si-1,05 3,2si3,21 dau coraoana