1
30/(x-1)(x+1)-(7+18x)/(x-1)(x²+x+1)
(x-1)(x+1)(x²+x+1)≠0⇒x≠1 U x≠-1
30*(x²+x+1)-(x+1)(7+18x)=13(x+1)
30x²+30x+30-7x-18x²-7-18x-13x-13=0
12x²-8x+10=0
D=64-480<0 нет решения<br>
2
(2x²+7)/(x+1)(x²-x+1)-2/(x²-x+1)=3/(x+1)
x³+1≠0⇒x≠-1
2x²+7-2(x+1)=3(x²-x+1)
3x²-3x+3-2x²-7+2x+2=0
x²-x-2=0
x1+x2=1 U x1*x2=-2
x1=2 U x2=-1 не удов усл