7/24 - 5/18 = 21/72 - 20/72 = 1/72
4/35 + 1/28 = 16/140 + 5/140 = 21/140
11/63 - 5/42 = 66/378 - 45/378 = 21/378 = 1/18
5/16+11/12=15/48+44/48=59/48
(4,5-x )*5,8=8,7 26,1-5,8x =8,7 -5,8x =34,8 x=-6
6*2+4*2=20см равен периметр
<span>Х+Y=18</span>
X+4=Y-4
X+4=Z
Y-4=Z
Z+Z=18
Z=9
X+4=9
X=5
Y-4=9
Y=13
<span>13+5=18</span>