Question

ajutorr nush aici dau coroana

Answer 1

a) (x+20) : 12+68=78 /-68
   =(x+20) : 12 = 10 /x12
   = x+20 =120 /-20
   = x=100

b) (x+282-75) :2=104 /x2
   = x+282-75 = 208   /+75
   = x+282 =  283  /-282
   = x = 1

c) x+4:10+101=133 /-101
   = x+4:10 = 32 
   = x+0,4 = 32  /-0,4
   = x = 31,6

d) (13a-416:4):7=13
   = (13a-104):7=13  /x7
   = 13a-104 =91   /+104
   = 13a =195   /:13
   = a = 15

e) [(b+260:2) x 3 +3]+5-12 =1997
   = [(b+130) x 3 +3]+5-12 =1997
   = (3b+390+3)+5-12 =1997
   = (3b+393)+5-12 =1997 /+12
   = (3b+393)+5=2009 /-5
   = 3b+393=2004  /-393
   = 3b =1611    /:3
   = b = 537

Coroana? =)