Răspuns :
E) 20-121:x=9
121:x = 9+20
121:x=29
x=29:121
x= 0,23
d) 14-3x=5
3x=5+14
3x=19
x=19:3
x=6,(3)
121:x = 9+20
121:x=29
x=29:121
x= 0,23
d) 14-3x=5
3x=5+14
3x=19
x=19:3
x=6,(3)
e) 20-121:x=9
121:x= 20-9
121:x= 11 => x= 121:11 => x=11 verificare: 20-121:11=9 => 20-11=9
d) 14 - 3x =5
3x= 14-5
3x=9 => x= 9:3 => x=3 verificare : 14-3x3=5 => 14-9=5
121:x= 20-9
121:x= 11 => x= 121:11 => x=11 verificare: 20-121:11=9 => 20-11=9
d) 14 - 3x =5
3x= 14-5
3x=9 => x= 9:3 => x=3 verificare : 14-3x3=5 => 14-9=5