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13/63+17/45-5/36-1/27

Răspuns :

63=3²×7
45
=3²×5
36
=2²×3²
27=
numitorul comun=2²×3³×5×7=3780

13/63+17/45-5/36-1/27 =(13×60+17×84-5×105-1×140)/3780=
=(780+1428-525-140)/3780=1543/3780