P=<span>ay(h-y)
p`=a*(h-y)+ay*(-1)=0
</span>2y=h
y=h/2 - точка максимума )))
36\12+13*2=3+26=29
всьо)))
1 ) 3 4/19 = 3*19+4 = 61/19 = 3,21
2) 3 1/8 = 3*8+1 = 25/8 =3,12
3) 3 2/3 = 3*3+2 =11/3 = 3,66
4 ) 3 5/16 = 3*16+5 = 53/16 = 3,21
120г, 120кг, 1200кг, 12т, 120т