1) 78.1 : 11 = 7.1
2)72.8:13 =5.6
3)65.8:14 =4.7
= (399/64 - 177/32) + (113\32 - 47\15) = 45/64 + 19\32 = 83\64 = 1 19/54
3)<
6)<
9)<
Заранее пожалуйста
8 9/20*2/13=169/20*2/13=13/10=1 3/10 или 1,3
-π/3+πn<2x+π/6<π/2+πn
-π/3-π/6+πn<2x<π/2-π/6+πn
-π/2+πn<4x<π/3+πn
-π/8+πn/4<x<π/12+πn/4
<span>x∈(-π/8+πn/4;π/12+πn/4)</span>