Решите пример. 3/4 : 5/6 + 2 1/2 x 2/5 - 1 : 1 1/6 =

3/4 : 5/6 + 2 1/2 x 2/5 - 1 : 1 1/6 =3/4*6/5 + 5/2 * 2/5 - 1 : 7/6 =
=3/4*6/5 + 5/2 * 2/5 - 1 : 7/6 =3/2*3/5 + 1 - 1 *6/7 =9/10+1-6/7=
=1 63/70-60/70=1 3/70