Răspuns :

Justinenciu1id

Răspuns:

a.n=10

b.n=42

c.n=14

d.n=16

e.n=12

f.n=64

g.n=74

h.n=11

i.n=38

j.n=5

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Mikelinaid

a) n/12=5/6

n=12×5:6=60:6=10

b)35/n=5/6

n=35×6:5=210:5=42

c)(n+1)/18=5/6

6(n+1)=5×18

6n+6=90

6n=90-6

n=84:6=14

d)30/(2n+4)=5/6

5(2n+4)=30×6

10n+20=180

10n=180-20

n=160:10=16

e) 105/(10n+6)=5/6

5(10n+6)=105×6

50n+30=630

50n=630-30

n=600:50=12

f) 55/(n+2)=5/6

5(n+2)=55×6

5n+10=330

5n=330-10

n=320:5=64

g) 50/(n-14)=5/6

5(n-14)=50×6

5n-70=300

5n=300+70

n=370:5=74

h)15/(n+7)=5/6

5(n+7)=15×6

5n+35=90

5n=90-35

n=55:5=11

i) (n-23)/18=5/6

6(n-23)=5×18

6n-138=90

6n=90+138

6n=228

n=228:6=38

j) 25/n(n+1)=5/6

5[n(n+1)]=25×6

5(n^2+n)=150

n^2+n=150:5

n^2+n=30

n=5