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Calculati va rog rapid dau coroana ...( 7/9 +17/10-1/18)-(13/27-1/18-7/9)+(1/10+1/15+1/9) dau coroana plss

Răspuns :

70/90+153/90-5/90-(26/54-3/54-42/54)+9/90+6/90+10/90=

218/90-(-19/54)+25/90=218/90+25/90+19/54=243/90+19/54=
27/10+19/54=

27*27/270+19*5/270=729/270+95/270=824/270=422/135