Помогите с решением; 1) - 2,8 : (7 - 14 ) - 10 = 2) 3 3/4* ( - 1 7/9 ) = 3)12 5/6 : 3 2/3...

Решите задачу:

$1)-2.8:(7-14)-10=-9.6\\\\1)7-14=-2\\2)-2.8:(-7)=0.4\\3)0.4-10=-9.6 \\ \\ 2)3 \frac{3}{4} *(-1 \frac{7}{9} )=-( \frac{15}{4} * \frac{16}{9} )=- \frac{15*16}{4*9} =- \frac{5*4}{3} =- \frac{20}{3} =-6 \frac{2}{3} \\ \\ 3)12 \frac{5}{6} :3 \frac{2}{3} = \frac{77}{6}: \frac{11}{3} = \frac{77*3}{6*11} = \frac{7}{2} =3.5$