Question

Aflati nr.necunoscut din urmatoarele expresii matematice :
(525:5+b);5+12=790

(65X502:10-c-63):3=600

[(e:8+5 6090:2-111]:10=400

9540:6X9-755):(g-386)=5

Answer 1

(525:5+b);5+12=790
(105+b):5=790-12
(105+b):5=778
105+b=778x5
105+b=3890
b=3890-105
b=3785

(65X502:10-c-63):3=600
(32630:10-c-63)=600x3
3263-c-63=1800
3263-c=1800+63
3263-c=1863
c=3263-1863
c=1400

9540:6X9-755):(g-386)=5
(1590x9-755){(g-386)=5
(14310-755):(g-386)=5
13555:(g-386)=5
g-386=13555:5
g-386=2711
g=2711+386
g=3097

Answer 2

E simplu : 
(525 : 5 + b ) : 5+12=790 | - 12 
(525 : 5+b) : 5 =778 | x 5
525 : 5 + b = 3890
105 + b = 3890 
           b = 3890 -105 
            b= 3785
(65x502 :10-c-63):3 = 600 | x 3 
32630 : 10 - c - 63 = 1800|+63 
3263 - c  = 1863 
3263 - c = 1863
          c = 3263  - 1863
           c=1400

(9540 :6x9-755):(g-386)= 5
(1590 x 9 -755) : ( g : 386) = 5 
(14310 - 755) : (g - 386 ) = 5 
13555 : (g - 386) = 5 : 13555 
   g - 386 = 2711
    g = 3097