№1. 1). = -2b / (7a^2)
2). =-2/3
3). = (x-2)^2 / 3(x-2) = (x-2)/3
4). = 9(a-c)^2 / 9(c-a)(c+a) = (c-a)^2 / (c-a)(c+a) = (c-a) / (c+a)
5). 5(4+2a+a^2) / (a-2)(a^2+2a+4) = 5/ (a-2)
6). =5c / 8a
7). = -7(2y-x) / 21(2y-x) = 11/3
. = (b+3)^2 / 3(b+3) = (b+3)/3
9). = 4(m-n)^2 / 16( n^2 -m^2)= (n-m)^2 / (n-m)(n+m) = (n-m)/(n+m)
№2
=2x/ (x^2-4) + 2 / (x^2-4) : ( (x+1) / 2(x-1) - 1/ (x-1) )=
=2x/ (x^2-4) + 2 / (x^2-4) : ( (x+1) / 2(x-1) - 2/ 2(x-1) )=
=2x/ (x^2-4) + 2 / (x^2-4) : ( (x+1-2) / 2(x-1))=
=2x/ (x^2-4) + 2 / (x^2-4) : ( (x-1) / 2(x-1))=
=2x/ (x^2-4) + 2 / (x^2-4) : 1/2= 2x/ (x^2-4) + (2 / (x^2-4))*2=
=2x/ (x^2-4) + 4 / (x^2-4)= (2x-4) / (x^2-4)= 2(x-2) / (x-2)(x+2)=
=2/(x+2)= 2/(0,5+2)= 2/2,5=(2*4)/ (2,5*4)=8/10 =0,8
1) (2b) \ (-7a^2*)
2) -2 \ 3
3) (X-2) \ 3
4)....продолжай.