Problemi 628 e 630
((5-30+1+4)/20)^3-(2/3)^2+((144-9-125)/60)^2
(20/20)^3-4/9+(1/6)^2
1-4/9+1/36
(36-16+1)/36
7/12
((-2+3)/4)^2-((50+60-70)/40)
1/16-40/40
1/16-1
-15/16
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