Problemi 549. Grazie
(- 3/7 + 5/14)^2=(- 1/14)^2=1/196
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(4/9 - 5/3 - 1/9)^3=(- 4/3)^3= - 64/27
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(7/5 - 13/20 - 1/4)^5= (1/2)^5= 1/32
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