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rezolvați ecuațile 

a) x - 3,25 = 7 supra 4 

b) x + 3,(2) = 23 supra 6

c) 2,35 + x =3 supra 1 supra 4

d)3,(3) - x = 3 supra 1 supra 4









Răspuns :

a) x - 3,25 = 7/4
x-325/100=7/4
x=7/4+325/100
x=( 175+325)/100
x=500/100=5

b) x + 3,(2) = 23/ 6
x+(32-3)/9=23/6
x+29/9=23/6
x=23/6-29/9
x=(69-58)/18=11/18=0,6(1)

c) 2,35 + x =3/ 1 / 4
2,35+x=3/1:1/4
2,35+x=3/1·4/1
x=12-2,35
x=9,65

d)3,(3) - x = 3/1 /4
(33-3)/9-x=3
·4
30/9-x=12
x=30/9-12
x=(30-108)/9
x=-78/9
x=-0,(6)