2x+3y = -11
2x-3y = 7
2x+3y+2x-3y = -11 + 7
2x + 2x = -4
4x = -4
x = -1
2*-1 - 3y = -11
-2 - 3y = -11
-3y = -11 + 2
-3y = -9
y = 3
3x - 4y = 2 ;
5x + 4y = 144 ;
Способом сложения ;
3х + 5х - 4y + 4y = 2 + 144 ;
8x = 146 ;
X = 18,25 ;
3 * 18,25 - 4y = 2 ;
4y = 54,75 - 2 ;
4y = 52,75 ;
Y = 13,1875 ;
Ответ ( 18,25 ; 13,1875 )
15х + 36х²-(36х²+6х-6х-1)-2,5х=0
2√31 ≈ 2*5,57 ≈ 11,14
5√5 ≈ 5*2,24 ≈ 11,18
3√14 ≈ 3*3,74, ≈ 11,22