Question

4 si 5 va rog frumos mult de tot​

Answer 1

Explicație pas cu pas:

4. (n•3,6+40-10)÷3-1/4=88,5

(n•18/5+30)÷3=177/2+1/4

(18n/5+30)÷3=354/4+1/4

(18n/5+30)÷3=355/4

18n/5+30=355/4•3

18n/5+30=1065/4

18n/5=1065/4-120/4

18n/5=945/4

n=945/4•5/18=4725/72=1575/24=525/8

5.(a+b+c)/3=20

a+b=40

b+c=3a

40+c=60

c=20

a+3a=60

4a=60

a=15

b=60-(15+20)=60-35=25

b=25