1)-2/3+2целэх4/9=-6/9+2.4/9=/6/9+1.18/9=1.14/9=2.5/9
2)2.5/9*9=2.5/1
lim {x->1} (x^2(x-1)-(x-1))/(x^2(x+1)-(x+1))=lim{x -> 1} (x^2-1)(x-1)/(x^2-1)(x+1)=
=lim{x->1} (x-1)/(x+1)=0/2=0
Ты должен две буквы соеденить ленейкой
7,2х+1,8х=x(7,2+1,8)=9х
1/6х+1/2х=х(1/6+1/2)=х(1/6+3/6)=4/6х=2/3х
9,3х-1,4х=х(9,3-1,4)=7,9х
3/4х-1/2х=х(3/4-1/2)=х(3/4-2/4)=1/4х
10х-6,7х=х(10-6,7)=3,3х
х-4/5х=х(1-4/5)=1/5х