1,8х+2,4(х+0,2)=2,16
1,8х+2,4х+0,48=2,16
4,2х=1,68
х=0,4 стоит 1 кг огур
0,4+0,2= 0,6 помид
(х+12)*2=84
2х+24=84
2х=84-24
х=60:2
х=30см" вторая сторона
(х+12)*2=80
2х+24=80
2х=80-24
2х=56
х=56:2
х=28см" вторая сторона
1) (1/6 + 2/3) * 3 = 5/6 * 3 = 5/6 * 3/1 = 5/2 = 2 1/2
2) (17/30 - 2/15) : 13 = 13/30 : 13 = 13/30 * 1/13 = 1/30
3) (1/8 + 3/4) : 5 = 7/8 : 5 = 7/8 * 1/5 = 7/40
4) (4/3 + 1/9) * 4 = 13/9 * 4 = 52/9 = 5 7/9
5) (1/2 + 1/3) * 2 = 5/6 * 2 = 5/3 = 1 2/3
6) (1/2 - 1/3) * 3 = 1/6 * 3 = 1/2