Question

Номер:1.26,1.27,1.28

Answer 1

1.26 1) (a-3)/(\/a-\/3)=(\/a+\/3)(\/a-\/3)/(\/a-\/3)=\/a+\/3

2)По аналогии ответ \/2x-\/5 и

3)\/a+\/b

1.27 1) (x ²-1)(1/x-1 - 1/x+1 - 1) =

(x-1)(x+1)(1/x-1 - 1/x+1 - 1)=

x+1-x+1-(x-1)(x+1)=2-x ²+1=3-x ²

2) (m+1+1/m-1):(m-m ²/m-1)=

(m ²-1+1/m-1)×(m-1)/m ²-m-m ²)=(m/m-1)((m-1)/-m)=-1

1.28 1) la ²l=a ²

2) lxl ²=x ²

3) ly³l=y ³ y>0

4) lml ³=-m ³ m<0