8х-3х=4-4
5х=0
х=0
Я не впевнена,але думаю що так.
Решениееееееееееееееееееееееееее
Х^2 + y^2 = 25
X - y = 7
X = y + 7
( y + 7 )^2 + y^2 = 25
y^2 + 14y + 49 + y^2 = 25
2y^2 + 14y + 24 = 0
D = 196 - 192 = 4 = 2^2
y1 = ( - 14 + 2 ) : 4 = - 3
y2 = ( - 14 - 2 ) : 4 = - 4
X1 = - 3 + 7 = 4
X2 = - 4 + 7 = 3
Ответ ( 4 ; - 3 ) ; ( 3 ; - 4 )
A1=429
d=-22
Sn=-3096.
Sn=(2a1-d(n-1))n/2.
-3096=(2*429+22(n-1))n/2. <span>n = 239</span>
= 2M*(1 - 2M) \ M - 3
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0.6X^2 - X - 0.4 = 0
D = 1 - 4*0.6 *(-0.4) = 1 + 0.96 = 1.96 V D = 1.4
X1 = 1 + 1.4 \ 1.2 = 2
X2 = 1 - 1.4 \ 1.2 = - 1\3