Question

13/79×{3,5:7/25+1/3×[7/9+2/3×(7/11-0,(3)):10/33]×18/13}

Answer 1

13/79 * {35/10 * 25/7 + 1/3 * [ 7/9 + 2/3 *(7/11 - 3/9) *33/10] * 18/13}=
= 13/79 * {25/2 + 1/3 * [7/9 + 2/3 * ( 7/11 - 1/3) * 33/10] * 18/13}=
=13/79 * {25/2 + 1/3 * [7/9 + 2/3 * (21/33 - 11/33) * 33/10] * 18/13}=
=13/79*[25/2 + 1/3 * (7/9 + 2/3 * 10/ 33 * 33/10) * 18/13]=
=13/79*[25/2 + 1/3 * (7/9 + 6/9) * 18/13]=
=13/79 * (25/2 + 1/3 * 13/9 * 18/13)=
=13/79 * (25/2 + 1/3 * 2)=
=13/79 * (25/2 + 2/3)=
=13/79 * (75/6 +4/6)=
=13/79 * 79/6 = 
=13/6