Question

помогите пожалуйста!

Answer 1

$frac{a {}^{2}b {}^{2} }{a {}^{2} + 2ab + b {}^{2} } div frac{ab}{a + b} = frac{a {}^{2}b {}^{2} }{(a + b) {}^{2} } times frac{a + b}{ab}$

$= frac{ab}{a + b} \ a = 4 - sqrt{3} \ b = 4 + sqrt{3}$

$frac{(4 - sqrt{3} )(4 + sqrt{3}) }{4 + sqrt{3} + 4 - sqrt{3} } = frac{16 - 3}{8} = frac{13}{8} = 1.625$