(-3)的2次方-(2分之3)的2次方×9分之2+6÷│-3分之2│的2次方
=9-(4/9)*(2/9)+6/((-2/3)*(-2/3))
=9-8/81+6*(9/4)
=9+8/81+27/2
=21+8/81+1/2
=21+83/162