1.

6나

Answer»

9/20 -[1/5 +{1/4+5/6-(1/3+1/2)}]= 9/20 - [ 1/5 + {1/4 +5/6 -5/6}]= 9/20 -1/5 -1/4= 9/20 - 9/20= 0



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