Помогите решить 1) 1 3/5 - 2 4/15=    ;    (-2 2/3) : (-1 4/9)=   ;      (7-8 4/5)* 2 1/3 - 14 : ( 2/3-3/4)=   . 2) решить уравнение     0,8 : х = 1 1/4 : 3 1/8

[latex]1 \frac{3}{5} -2 \frac{4}{15} = \frac{8}{5} - \frac{34}{15} = \frac{8*3-34}{15} = -\frac{10}{15} =- \frac{2}{3} [/latex] [latex](-2 \frac{2}{3} ):(-1 \frac{4}{9} )=(- \frac{8}{3} ):(- \frac{13}{9} )=(- \frac{8}{3} )*(- \frac{9}{13} )= \frac{24}{13} =1 \frac{11}{13} [/latex] [latex](7-8\frac{4}{5})*2\frac{1}{3}-14:(\frac{2}{3}-\frac{3}{4})= \\ \\ 1)7-8\frac{4}{5}=7-\frac{44}{5}=\frac{7*5-44}{5}=-\frac{9}{5}=-1\frac{4}{5} \\ \\ 2)(-1\frac{4}{5})*2\frac{1}{3}=(-\frac{9}{5})*\frac{7}{3}=(-\frac{3}{5})*7=-\frac{21}{5}=-4\frac{1}{5} \\ \\ 3)\frac{2}{3}-\frac{3}{4}=\frac{2*4-3*3}{12}=-\frac{1}{12} \\ \\ 4)14:(-\frac{1}{12})=14*(-12)=-168 \\ \\ 5)(-4\frac{1}{5})-(-168)=(-\frac{21}{5})-(-168)=(-\frac{21}{5})+168=\frac{-21+168*5}{5}= \\ \\ =\frac{819}{5}=163\frac{4}{5} [/latex] [latex]0,8:x=1\frac{1}{4}:3\frac{1}{8} \\ \\ \frac{8}{10}:x=1\frac{1}{4}:3\frac{1}{8} \\ \\ \frac{4}{5}:x=\frac{5}{4}:\frac{25}{8} \\ \\ \frac{4}{5}*\frac{1}{x}=\frac{5}{4}*\frac{8}{25} \\ \\ \frac{4}{5x}=\frac{8}{20} \\ \\ 5x*8=4*20 \\ 40x=80 \\ x=80:40 \\ x=2[/latex]