Question

已知-2a^2b^y+1与3a^2b^3是同类项,且2/3（x-5)^2+5|m|=0,求代数式（2x^2-3xy+6y

Answer 1

-2a^2b^y+1与3a^2b^3是同类项

y=3

x-5=0 m=0

x=5

（2x^2-3xy+6y^2)-m(3x^2-xy+9y^2) m=0

=2x^2-3xy+6y^2 x=5,y=3

=2×5²-3×5×3+6×3²

=50-45+54

=59