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a fost răspuns

efectuati diferenta dintre x - y , scriind rezultatul in fiecare caz sub forma unei fractii zecimale:
a)x=8,(5) y=4,(3)
b)18,(23)-7,(19)
c)15,(4)-9,(3)
d)11,2(5)-6,1(3)
e)11,3(4)-5,(6)
f)4,(8)-2,5(57)

Răspuns :

8,(5)-4,(3)=(85-8)/9 -(43-4)/9=(77-39)/9=38/9=4,(2)

18,(23)-7,(19)=(1823-18)/99 -(719-7)/99=1805/99 -712/99=1093/99=11,(04)

15,(4)-9,(3)=(154-15)/9-(93-9)/9=55/9=6,(1)

11,2(5)-6,1(3)=(1125-112)/90 -(613-61)/90=461/90=5,1(2)

11,3(4)-5,(6)=(1134-113)/90-(56-5)/9=1021/90 -51/9=(1021-510)/90=5,6(7)

4,(8)-2,5(57)=(48-4)/9 -(2557-25)/990=44/9 -2532/990=(4840-2532)/990=

2,3(31)

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