Question

afla numarul necunoscut :
a.(5×a)-24 =26
b.36 -(18:a)=30
c.45+(5×a)=50
faceti si verificarea .

Answer 1

a.5xa=26+24
   5xa=50
    a=50:5
    a=10
5x10-24=50-24=26
b.18:a=36-30
    18:a=6
      a=18:6
      a=3
36-18:3=36-6=10
c.5xa=50-45
   5xa=5
    a=5:5
    a=1
45+5x1=45+5=50

Answer 2

a. (5*a)-24=26
5*a=26+24
5*a =50
a=50:5
a=10
(5*10)-24=26

b.36-(18:a)=30
36=30+(18:a)
18:a=36-30
18:a=6
a=3
36-(18:3)=30

c.45+(5*a)=50
5*a=50-45
5*a= 5
a=1
45+(5*1)=50