А) x≠0 b) x≠0 x≠2 c) x≠0, x≠1
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=2x²/y²; =3(a+b)/6(a+b)=1/2; =x(x+2y)/y(x+2y)=x/y;
=(p-2)(p+2)/(p-2)=p+2
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=(8-5)/(a+1)=3/(a+1);
=(2x+3)/(x-7)-5x/(x-7)=(2x+3-5x)/(x-7)=-3(x-1)/(x-7);
=[15m+10+6m]/m(3m+2)=(21m+10)/m(3m+2);
=(1/n(n+2))(n-3+4n-5n-10)=[1/n(n+2)]·(-13)=-13/n(n+2)
=1/(y²-1) ·(4-2y+2+y+1)=(-y+7)/(y²-1)