Question

Помогите решиться вот фотка я хз

Answer 1

$left(sqrt{5frac35}-sqrt{12frac35}right):sqrt{frac7{45}}=left(sqrt{frac{28}5}-sqrt{frac{63}5}right):sqrt{frac7{45}}=\=sqrt{frac{28}5}:sqrt{frac7{45}}-sqrt{frac{63}5}:sqrt{frac7{45}}=sqrt{frac{28}5}cdotsqrt{frac{45}7}-sqrt{frac{63}5}cdotsqrt{frac{45}7}=\=sqrt{frac{28}5cdotfrac{45}7}-sqrt{frac{63}5cdotfrac{45}7}=sqrt{4cdot9}-sqrt{9cdot9}=sqrt{36}-sqrt{81}=6-9=-3$