1.(x+1)+x(x+1)=(x+1)·1+x(x+1)=(x+1)(1+x);
2.m²(n+1)+2m(n+1)=(n+1)(m²+2m)=(n+1)m(m+2);
3.x(y-z)+3(z-y)=x(y-z)-3(y-z)=(y-z)(x-3);
4.a(b-c)-b(c-b)
=a(b-c)+b(b-c)
=(b-c)(a+b).
<span>f(x)= log_7(5-x)
ОДЗ: 5-x>0
-x>-5
x<5
при x<5, log_7(5-x)</span>≥0
E(f)=y∈(0;+∞)
прилагаю график