Question

Сократите дробь
b-7
_____
b²-14b+49


125y³+1
______
1-5y+25y²

Answer 1

=$frac{b-7}{(b-7)(b+7)} = frac{1}{b+7}$

=$=frac{(1+5y) (1+5y)(1+5y)}{(1-5y)(1+5y)} = frac{1+10y+ 25y^{2} }{1-5y}$