Question

помогите пожалуйстааа

Answer 1

А93 )

$frac{a sqrt{a} + b sqrt{b} }{ sqrt{a} + sqrt{b} } + ( {ab})^{ frac{1}{2} } = frac{ {( sqrt{a} })^{2} sqrt{a} + { (sqrt{b} )}^{2} sqrt{b} }{ sqrt{a} + sqrt{b} } + sqrt{ab} = \ \ = frac{ ({ sqrt{a} })^{3} + { (sqrt{b}) }^{3} }{ sqrt{a} + sqrt{b} } + sqrt{ab} = frac{( sqrt{a} + sqrt{b})(a - sqrt{ab} + b )}{ sqrt{a} + sqrt{b} } + sqrt{ab} = \ \ = a - sqrt{ab} + b + sqrt{ab} = a + b = frac{19}{4} + 3.25 = 4.75 - 3.25 = 1.5$

А94 )

$frac{a sqrt{a} - b sqrt{b} }{ {a}^{ frac{1}{2} } - {b}^{ frac{1}{2} } } - sqrt{ab} = frac{ ({ sqrt{a}) }^{3} - { (sqrt{b} })^{3} }{ sqrt{a} - sqrt{b} } - sqrt{ab} = frac{( sqrt{a} - sqrt{b} )(a + sqrt{ab} + b) }{ sqrt{a} - sqrt{b} } - sqrt{ab} = \ \ = a + sqrt{ab} + b - sqrt{ab} = a + b = frac{14}{5} + 2.2 = 2.8 + 2.2 = 5$