Question

15mn - 2n + 15m^2 -2m при m= 2/15; n=-2

Answer 1

$15mn - 2n + 15m^2 -2m=(15mn+ 15m^2)+( - 2n -2m)=$

$=15m(n+m)-2(n+m)=(n+m)(15m-2)=$

$=(-2+ \frac{2}{15} )(15* \frac{2}{15} -2)= \frac{-2*15+2}{15} *( 2-2)=- \frac{28}{15} *0=0$