Răspuns :
(x+x/4+x/2):2=35
(x+x/4+x/2)=35·2
(4x+x+2x)/4=70
7x=70·4
7x=280
x=280/7
x=40
verificare
40+40/4+40/2):2=35
(40+10+20):2=35
70:2=35
(x+x/4+x/2)=35·2
(4x+x+2x)/4=70
7x=70·4
7x=280
x=280/7
x=40
verificare
40+40/4+40/2):2=35
(40+10+20):2=35
70:2=35
x + x/4 + x/2 = y
y/2 = 35 => y = 70
x + x/4 + x/2 = 70 |•4
4x + x + 2x = 280
7x = 280
x = 280/7
x = 40
y/2 = 35 => y = 70
x + x/4 + x/2 = 70 |•4
4x + x + 2x = 280
7x = 280
x = 280/7
x = 40