1) f(x)=x^2-2x+3/4
f`(x)= 2x-2
2x-2=0
2x=2
x=1
О: xmin=1
2) f(x)=4-8x-5x^2
f`(x)= -8-10x
-8-10x=0
-10x=8
x=8/10 = 4/5
O: xmin=4/5
3) f(x)= x^4/4-x+5
f`(x)= x^3-1
x^3-1=0
x^3=1
x= 1
O: xmin=1
решние
2) у2-8у+16-(8у+16)=у2-8у+16-8у-16=у2-16у
4) к2+14к+49-14к-50=к2-1
6) 15+(2/5+с)2-0.8с2=15+4/25+4/5с+с2-0.8с2= 379/25+4/5с+0.2с2
<span>1 - 6 (х - 2) = 14 - 8х
1 - 6x + 12 = 14 - 8x
8x - 6x = 14 - 13
2x = 1
x = 1/2 = 0,5 </span>