Д)=4a/ 3(a-2) -3a/4(a-2)=16a-9a /12(a-2)=7a/12(a-2)
е)=2a²-5a+4-(a-3)(a-2) /(a-2)²=2a²-5a+4-a²+2a+3a-6 /(a-2)²=a²-2/(a-2)²
ж)=3ax-27a² /x(x-3a) -3a²-x² /a(x-3a)=3a²x-27a³-3a²x+x³ /ax(x-3a)=
=x³-27a³/ax(x-3a)=(x-3a)(x²-3ax+9a²)/ax(x-3a)=x²-3ax+9a²/ax
з)=b-1/b²-b+1 -2/(b+1)(b²-b+1)=(b-1)(b+1)-2 /(b+1)(b²-b+1)=b²-1-2/b³+1=
=b²-3/b³+1
2) =b(b²-16)-b³+15b+4 /b²-16=b³-16b-b³+16b+4/b²-16=-b+4/b²-16=
=-(b-4)/(b-4)(b+4)=-1/b+4
-1/-4.5+4=-1/-0.5=2