x^2=(2√2+1)^2=8+4√2+1=9+4√2x^2-2x-9=9+4√2-4√2-2-9=-2x^3-11x-15=x*(x^2-11)-15=x*(9+4√2-11)-15=(2√2+1)*(9+4√2-11)-15=(2√2+1)*(4√2-2)-15=2*(2√2+1)*(2√2-1)-15=2*7-15=-1所以原式=-2/-1 =2...