Question

пожалуйста помогите

Answer 1

$( \frac{11}{10} +\frac{11}{13}): \frac{22}{39} = \frac{11*13+11*10}{130} : \frac{22}{39} =\frac{143+110}{130} : \frac{22}{39} =\frac{253}{130} : \frac{22}{39} =\frac{253}{130}* \frac{39}{22} = \\ =\frac{23*11}{13*10}* \frac{3*13}{2*11} = \frac{23}{10} * \frac{3}{2} = \frac{69}{20} =3 \frac{9}{20} =3,45$