Question

Aflati nr necunoscut:
a. (525/5+b)/5+12=790
b. (65*502/10-c-63)/3=600
c.[(e/8+5609)/2-111]/10=400
d. (540/5*9-755)/(g-386)=5

Answer 1

 a) (525/5+b)/5+12=790
(105+b) / 5 +12=709/-12
105 +b /5=  697 x 5
105+b=3485-105
b=3380
  
b) (65*502/10-c-63)/3=600
   32630/10-c-63=600 x 3
    3263-c-63=1800/+63
   3263-c=1863
  c=3263-1863
  c=1400

c)[(e/8+5609)/2-111]/10=400
   (e/8+5609)/2-111=400 x 10
    (e/8+5609)/2-111=4000/+111
   (e/8+5609)/2=4111/x2
   e/8 +5609=8222/-5609
    e/8=2613 x 8
    e=20904

d)(540/5*9-755)/(g-386)=5
    540/45 - 744 / g-386=5
    12-744/g-386=5/+386
    12-744/g=391-12
     -744/g=379/ x 744
    g=281976