5+(7y-12)/3=y+13. 5*3+7y-12=3(y+13). 15+7y-12=3y+39. 7y-3y=39-15+12. 4y=36 (:4).
1)
1.(x+2)*3(x-1)/(x-1)²(x-2)(x+2)=3/(x-1)<span>(x-2)
2.3-3(x-1)</span>/(x-1)(x-2)= -3/<span>(x-1)=7,5
2)
1.y(y-3)/(y-3)</span>² - 3y(y+3)/(y-3)<span>(y+3)=y/(y-3) - 3/(y-3)= (y-3)/(y-3)=1
2. 1 * ( 1 - 3/y)= y-3/y= 11/6</span>
[y=3-x
[y=2
3-X=2
-x=2-3
-x=-1
x=1
3kx+k²x²-9kx=0
k²x²-6kx=0
kx(kx-6)=0
kx=0⇒x=0 U k∈R
kx=6⇒x=6/k,k≠0
Ответ k∈(-∞;0) U (0;∞)