(3.14-3.14159)°-(-0.5)-2+|1-√8|-4cos45°
=1+0.5-2+√8-1-4x√2/2
=1+0.5-2+2√2-1-2√2
=1.5-2-1
=1.5-3
=-1.5
答题不易,求采纳~