Question

Решите! Пожалуйста( очень надо) даю максимальное количество балов!

Answer 1

$= frac{ sqrt{3} + sqrt{a} + sqrt{3} - sqrt{a} }{ (sqrt{3} - sqrt{a})( sqrt{3} + sqrt{a} )} times frac{ sqrt{3} (a - 3)}{6} = frac{2 sqrt{3} }{(sqrt{3} - sqrt{a})( sqrt{3} + sqrt{a} )} times frac{ sqrt{3}( sqrt{a} - sqrt{3} )( sqrt{a} + sqrt{3}) }{6} = frac{ - 2 sqrt{3} times sqrt{3} }{6} = - 1$

2) y/(y^2-9) = 1/y(y+3) - 3/(2y*(3+y))
y/(y^2-9) = 2-3/(2y(y+3))
y/(y^2-9) = -1/(2y(y+3))
y=-1*(y^2-9)/(2y*(y+3))
y = -1*(y-3)(y+3)/(2y*(y+3))
y=-1*(y-3)/2y
2y^2 = 3-y
2y^2+y-3=0
D= 1-4*2*(-3) = 25
y1=(-1+5)/4 = 1
y2=(-1-5)/4 = -3/2