Question

Compara numerele X si Y, folosind unul din semnele <, > sau =, daca:
[(X + 780 : 6) x 3 + 4] x 5 = 1985
(Y : 2 - 5) x 3 - 91 : 7 = 2

Answer 1

[(X+780:6)•3+4]•5=1985

[(X+130)•3+4]•5=1985

(X+130)•3+4=1985:5

(X+130)•3+4=397

(X+130)•3=397-4

(X+130)•3=393

X+130=393:3

X+130=131

X=131-130

-> X=1 <-

(Y:2-5)•3-91:7=2

(Y:2-5)•3-13=2

(Y:2-5)•3=2+13

(Y:2-5)•3=15

Y:2-5=15:3

Y:2-5=5

Y:2=5+5

Y:2=10

Y=10•2

-> Y=20 <-

X=1

Y=20

X<Y

1<20