Ответ!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
A) x=0.5
y=1-5*0.5=1-2.5= -1.5
x=-2
y=1-5*(-2)=1+10=11
b) 1-5x=0
-5x= -1
x=1/5
x=0.2 - нуль функции
№1
{y^2 - 5x-24=0
{x-y+2=0
{y^2 - 5x-24=0
{x=y-2
{y^2 - 5(y-2)-24=0
{x=y-2
{y^2-5y-14=0
{x=y-2
|y^2-5y-14=0
|Д=B^2-4ac
|Д=25+4*14
|Д=81
y1\2=-b+-кореньД/2а
y1\2=5+-9/2
y1=-2
y2=7
x1=-2-2=-4
x2=7-5=5
(-4;-2);(5;7)
76,4²+13,6²+2*76,4*13,6=(76,4+13,6)²=90²=8100
257²-143²=(257-143)(257+143)=114*400=45600