9x^2-3xy/12xy-4y^2 при x=0,5, y=0,25

Question

9x^2-3xy/12xy-4y^2 при x=0,5, y=0,25

Answer 1

3xy/12xy=1/4 9x^2-1/4-4y^2=9*(1/4)-4*(1/16)-1/4=9/4-1/4-1/4=7/4=1.75