Răspuns :

Pgabrielacasandid
a) x=5*7/20=1,7(5) 
b) x+1=10*3/9=3,3(3)
x=3,3(3)-1=2,3(3)
5/x=20/7
20x=5·7
20x=35
x=35/20 simplificam=7/4=1,75
b)⇒9(x+1)=3·10
9x+1=30
9x=30-1
9x=29
x=29/9=3,(2)

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