Y=(x²+361)/x=x+361/x
y`=1-361/x²=(x²-361)/x2
x²=361
x=-19 U x=19
+ _ +
--------------(-19)------------(19)-----------------
min
ymin=y(19)=38
( - 1/7a3b4c2) ( 3 1/2a2bc3) = -1/7*7/1*a5b5c5 = -a5b5c5= -(abc)^(5)
(2m2 + 3/5n) (3/5n - 2m2) = 6/5m2n -4m4+9/25n2-6/5nm2=9/25n2-4m4=(3/5n-2m2)(3/5n+2m2)
<span>(18x3y3 - 12x4y) : (6x3y) = 6x3y(3y2-2x) / 6x3y = 3y2-2x</span>
Разделим числитель и знаменатель на cosa 3-4sina/cosa /2sina/cosa -5=3-4tga /2tga-5= 3-4*3 / 2*3-5=3-12 /6-5=-9
..........................................................................