(2x-1)/(x²-9)
x²-9≠0
(x+3)(x-3)≠0
a)x+3≠0, x≠-3
b)x-3≠, x≠3
Otvet: x∈(-∞,-3)∪(-3,3)∪(3,∞)
X-y=73
x*(1-0,6)-y*(1+0,5)=5
************
x-y=73
x*0,4-y*1,5=5
************
x-y=73
4x-15y=50
************
4x-4y=292
4x-15y=50
************
11у=242
у=22
x=73+22=95
*********
x=95
у=22
Решение во вложении на фото: