Question

Va rog cat mai repede dau coroana.

Answer 1

1/5{2/5+2/5+[3/5+1/5×(4/5-9/5x)]}=2/5

5×1/5×{2/5+2/5+[3/5+1/5×(4/5-9/5x)]}=5×2/5

2/5+2/5+[3/5+1/5×(4/5-9/5x)]=2

2/5+2/5+[3/5+4/25-9/25x]=2

2/5+2/5+[ /15+4/2 -9/25x]=2

2/5+2/5+[19/25-9/25x]=2

2/5+2/5+19/25-9/25x=2

/10+10+19/25 -9/25x=2

39/25-9/25x=2

25×39/25-25×9/25x=25×2

39-9x=50

-9x=50-39

-9x=11

x=-11/9

sau x=-1 intreg 2/9= 1.(2)..........

/bara inseamna supra/