Răspuns :

Răspuns:

Explicație pas cu pas:

12.

L = 24 m

l = 24*5/6 = 20 m

____________

a)

L / l = 24/20 = 6/5

b)

l / L = 20/24 = 5/6

c)

P = 2*(24 + 20) = 2*44 = 88 m

P/L = 88/24 = 11/3

d)

l/P = 20/88 = 5/22

_______________________________

13.

a/b = 9/5

b/c = 18/25

a/b*b/c = a/c

9/5*18/25 = a/c

a/c = 162/125

_________________________________

14.

a/b = 5/3

a = 5/6

b = a : 5/3 = a*3/5 = 5/6*3/5 = 3/6 = 1/2

Semaka2id

Răspuns:

L=24m

l=5L/6

___________________

l=24·5/6=4·5=20m

a.L/l=24/20=6/5

b.l/L=20/24=5/6

c, P=2(L+l)

P=2(24+20)=2·44=88cm

P/L=88/24= simplifici prin 8=11/3

d,l/P=20/88=simplifici prin 4=5/11

13.a/b=9/5

b/c=18/25

a/b*b/c =simplifici prin b=a/c=9/5·18/25=9·18/5·25=162/125

14.a/b=5/3   si a=5/6

a=5b/3

inlocuiesti a in raport si obtii

(5/6)=5b/3 Imparti egalitatea  prin 5

1/6=b/3

3·1=6b

3=6b

b=3/6

b=1/2

Explicație pas cu pas: