Question

Dau COROANA!!!!!!!!!!!!!!!​

Answer 1

x=a+a²

y=a-1

z=a²-1

$\frac{x*y}{z} =?$

x*y=a+a²+a-1=a²+2a-1

$\frac{a^{2}+2a-1 }{a^{2} -1} =\frac{a(a+2-1)}{a(a-1)} =\frac{a(a+1)}{a(a-1)} =\frac{a+1}{a-1} =1$
raspus D. 1