Question

ПОМОГИТЕ ПОЖАЛУЙСТА!!!!

Answer 1

Номер 1:
$a = \frac{11 \times 2}{3 \times 3} = \frac{22}{9} = 2 \frac{4}{9}$
$b = \frac{18 + 4}{9} = \frac{22}{9} = 2 \times \frac{4}{9}$
a=b
Номер 2:
$\frac{2x + 2y}{2} - \frac{ {x}^{2} + {y}^{2} }{x + y} =$
$= \frac{(2x + 2y) \times (x + y) - ( {x}^{2} + {y}^{2}) \times 2 }{2(x + y) }$
$= \frac{2x^2 + 2xy + 2xy + 2 {y}^{2} - 2{x}^{2} - 2 {y}^{2} }{2(x + y) }$
$\frac{4xy}{2(x + y)} = \frac{2xy}{x + y}$
Номер 3:
$\frac{ \sqrt{108} + \sqrt{12} }{ \sqrt{3} } = \frac{6 \sqrt{2} + 2 \sqrt{3} }{ \sqrt{3} } = \frac{8 \sqrt{3} }{ \sqrt{3} } = 8$