P/(2-p)=(p(2+p))/(2-p)(2+p)=p(2+p)/(4-p²)=-p(2+p)/(p²-4)=(р²+2р)/(4-р²) ответ последний
X^2-25=x^2-5^2=(x-5)(x+5);
81x^2-18xy+y^2=(9x-y)^2=(9x-y)(9x-y).
1,(3) ⇒1+ 3/9 =1 + 1/3 = 1 1/3 или 4/3 ;
3,(54) ⇒ 3+54/99=3 +6/11 =3 6/11 или 39/11 ;
21 ,(23) ⇒21+23/99 =21 23/99 или (21*99+23)/11 =(2079+23)/99 =2102/9 ;
0,(673) ⇒673/999;
7,(256) ⇒7 256/999.
A)3b•3b²=9b³
б)8а²b⁴•a³b=8a^5b^5
в)-4a³b⁴•-4a⁴b^5
г)-17а^8b¹²•2ab