135+255+110=500282+83+135=500136+109+255=500
1). = (1*4*6) / (2*3*5) = 4/5
2). = (1*8*3) / (6*5*2) = 4/10 = 2/5
3). = (1*5*10) / (3*2*7) = 25/21 = 1 целая 4/21
4). = (5*15*5) / (3*16*4) = 125/64 = 2 целых 3/64
5) = (5*6*9) / (3*7*4) = 45/14 = 3 целых 3/14
6) = (3*12*8) / (2*17*7) = 144/119 = 1 целая 25/119
Y'=(4x(1-7x)+14x^2)/(1-7x)^2
y'=(4x-14x^2)/(1-7x)^2
4 (9-30а+ 25а^2) - 5( 2а^2 - 9а + 9) = 36 - 12а +100 а^2 - 10а^2 + 45а - 45= 90а^2 + 33а - 9
вроде так