S=Πrl+Πr^2
S=750Π+225Π=975Π см^2
V=1/3Πr^2h
h=√50^2-15^2=√2275
V=75√2275 Π см^3
24+9=33 - тополя
24+33=57 - березы
24+33+57=114 - деревьев
62:6=10(ост.2)
64:5=12(ост.4)
31:7=4(ост.3)
70:8=8(ост.6)
50:9=5(ост.5)
У+(у+7)+у+(7-8)=81
у+у+7+у+7-8=81
3у+6=81
3у=75
у=25
A) = 7 30/48 + 2 32/48 - 4 9/48 = 5 53/48 = 6 5/48
б) = 16 46/50 - 4 35/50 - 5 10/50 = 7 1/50
в) = 18 - ( 3 9/12 + 2 2/12) = 18 - 5 11/12 = 12 1/12