Question

Хелп!!!!зделайте плз

Answer 1

1.

$\dfrac{x^2+x-6}{x^2+3x-10} =\dfrac{x(x+3)-2(x+3)}{x(x+5)-2(x+5)} =\\\\=\dfrac{(x+3)(x-2)}{(x+5)(x-2)} =\dfrac{x+3}{x+5}$

2.

$\dfrac9{7-4\sqrt3 } =\dfrac{9(7+4\sqrt3 )}{7^2-(4\sqrt3 )^2} =\dfrac{63+36\sqrt3 }{49-48} =\\\\=63+36\sqrt3$