a) 5/9 = 8/9 + 2/9 - spatiu/9
b) 25/100 = 5/100 +14/100 + spatiu/100


Răspuns :

5/9 = 8/9 + 2/9 - a/9

5/9 = 10/9 - a/9

a/9 = 10/9 - 5/9

a/9 = 5/9

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25/100 = 5/100 + 14/100 + b/100

25/100 = 19/100 + b/100

b/100 = 25/100 - 19/100

b/100 = 6/100
 
A) 5/9=8/9+2/9-x/9
5/9=10/9-x/9 => x/9=10/9-5-9
x/9=5/9

B) 25/100=5/100+14/100+x/100
25/100=19/100+x/100 => x/100= 25/100-19/100=6/100

(x=spatiu)

Sper că te-am ajutat!