(π-2)^0-丨3√8+√2丨*(-2/√8)-cos45°=1+（5√2）*√2/2-√2/2=1+5-√2/2=6-√2/2(x/x-1 - x/x^2-1)÷x^2-x/x^2-2x+1,=[x(x+1)-x]/（x^2-1）×(x-1)^2/x(x-1)=[x^2]/（x-1）（x+1）×(x-1)/x=x/(x+1)令x=2原式=2/...