Question

упростите выражение

Answer 1

б)

1) $\frac{y+1-y}{y+1} =\frac{1}{y+1}$

2) $\frac{1}{y+1}*\frac{3(y+1)}{5}= \frac{3}{5}= 0.6$

в) $\frac{a^{2}+ab+ab+b^{2}-a^{2}+ab+ab-b^{2}}   {(a-b)(a+b)} =\frac{4ab}{(a-b)(a+b)}*\frac{(a-b)^{2}} {4ab}=\frac{a-b}{a+b}$