Помогите решить уравнения (все)p.s.На фотографиях

[latex] \frac{1}{ \frac{1}{28} + \frac{1}{36} } = 1: ( \frac{1*9+ 1*7}{252} ) = 1 : \frac{16}{252} = 1 : \frac{4}{63} = 1* \frac{63}{4} = 15 \frac{3}{4} = 15,75[/latex] [latex]( \frac{4}{13} - \frac{3}{26} )* \frac{39}{5} = \frac{4*2-3}{26} * \frac{39}{5} = \frac{5*39}{26*5} = \frac{1*3}{2*1} = 1 \frac{1}{2} =1,5[/latex] [latex]( \frac{7}{50} - \frac{5}{36} ) : \frac{2}{9} = \frac{7*18 - 5*25}{900 } * \frac{9}{2} = \frac{126-125}{900} * \frac{9}{2} = \frac{1*9}{900*2} = \frac{1}{200} [/latex] [latex]3 \frac{1}{25} : (1 \frac{5}{14} - 1 \frac{4}{15} ) =3 \frac{1}{25} : ( \frac{19*15-19*14}{210} ) = \frac{76}{25} : \frac{19}{210} = \frac{76*210}{25*19} = \\ \\ = \frac{4*42}{5*1} = \frac{168}{5} = 33,6 [/latex] [latex]2 \frac{16}{17} : ( \frac{1}{34} + 1 \frac{5}{18} ) = \frac{2*17+16}{17} : \frac{1*9 + 23*17}{306} = \\ \\ = \frac{50}{17} : \frac{400}{306} = \frac{50}{17} : \frac{200}{153} = \frac{50*153}{17*200} = \frac{1*9}{1*4} = 2 \frac{1}{4} =2,25[/latex]