1)1500х20=30000(м)-по земле 2)1500х3=4500(м/мин) 3)20:4=5(мин)-он летит по небу 4)4500х5=22000(м)
А) 1 - 4/9 = 1/1 - 4/9 = 9 - 4/9 = 5/9
б) 8 8/15 - 4 9/20 = 128/15 - 89/20 = 512 - 267/60 = 245/60 = 49/12
в) 4/1 - 3 3/4 = 4/1 - 15/4 = 16 - 15/4 = 1/4
г) 9 4/21 - 4 11/14 = 193/21 - 67/14 = 386 - 201/42 = 185/42
д) 7 1/10 - 3 1/6 = 71/10 - 19/6 = 213 - 95/30 = 118/30 = 59/15
е) 5 5/33 - 4 1/2 = 170/33 - 9/2 = 340 - 297/66 = 43/66
(x³/(x²-2x))`=(x³/x(x-2))`=(x²/(x-2))`=[(x²)`*(x-2)-(x-2)`*x²]/(x-2)²=
=(2x(x-2)-1*x²)/(x-2)²=(2x²-4x-x²)/(x-2)²=(x²-4x)/(x-2)²