123456789-0987643=122469146
4 ^ Х - 4 ^ ( Х - 1 ) < 3
4 ^ Х • ( 1 - 0,25 ) < 3
4 ^ Х < 3 : 0,75
4 ^ Х < 4
Х < 1
Ответ ( - бесконечность; 1 )
S = x* y = 24;
d^2 = x^2 + y^2= 73;
x* y =24; ⇒ x =24/y;
x^2 + y^2 = 73; 576/ y^2 + y^2 = 73;
y^2 = t >0;
576 / t + t = 73;
t^2 - 73 t + 576 =0;
D = 73^2 - 4*1*576= 5329-2304 =3025=55^2;
t1= (73+55)/2=64; ⇒y^2 = 64; ⇒y = 8; ⇒x=24/8 =3;
t2=(73-55)/2= 9; ⇒ y^2 = 9; ⇒ y= 3; ⇒ x= 24/3 = 8.
P = 2( x+y) = 2( 8 + 3 ) = 2*11 = 22
2) (0,2x-y)²=0.004x²-0.4xy+y²
4) ( 1/2m=2n)³ = 1/9m³ + 3m²n + 3mn²+8n³
6) ( -x - 2y) * ( - x + 2y) = x² - 4y²
8) ( 3 - a ) * ( 9 + 3a + a²) = 27 - a³