8/15n+2/3n+n-8/15n=1 2/3n
1)1 2/3*3/5=5/3*3/5=15/15=1
2)1 2/3*12=5/3*12/1=60/3=20
X-ширина
4x=x+600
X=600/3=200м-ширина
200+600=800м-длина
P=2(200+800)=2*1000=2000м-периметр
S=200*800=160000м2-площадь
3 This is her TV
4 This is them radio
5 This is my lamp
6 This is her bed
7 This is them TV
8 This is his radio
9 This is them lamp
10 This is his bed
1)9*3=27 человек было сначала
2)27-9=18 человек осталось