1) V275 ~16^2 значит Д
2)(a^2+2V5a+5)/(a-V5)(a+V5)=(a+V5)^2/(a-V5)(a+V5)=(a+V5)/(a-V5) 4)
3)
0.5(4t^2-8t+m)=2t^2-2t+n
2t^2-4t+m/2=2t^2-2t+n
4t^2-8t+m=4t^2-4t+2n
-4t= 2n-m
t=(2n-m)/ -4
t=(m-2n)/4
4)(2V125+2V20-2V80)/3V5= (10V5+4V5-8V5)/ 3V5 = (6V5/3V5)=2
5) V9-6x+x^2/x-1 * (2x+2) / (3x-x^2) =2/x
6)
{(x-1)^2+(y+2)^2=x^2+y^2+5
{y-2x=6
{x^2-2x+1+(2x+8)^2=x^2+(6+2x)^2+5
{x^2-2x+1+4x^2+32x+64 =x^2 + 36+24x+4x^2+5
{30x+65 = 24x+41
{ 6x=-24
{x=-4
{y=2
7) 2<=3x-4<=11</p>
2<=x<5</strong>
8)(1-3x)(x+1)=x^2-1
x=-1
x= 1/2
-1^2+1/2^2=1+1/4= 5/4 =1.25
x^2(x+2)=(x+2)
x^2=1
x=+/-1
x=2
2^2+1+1=6
x^2(x-4)=(x-4)
x=-/+1
x=4
1+1+16=18
1/t+1/(t-5)=1/6
3 вариант!