[6(1/4)]-1/2+2(√3-√5)0-(-1/2)-2-(-2/5)-1;
原式=(25/4)-1/2+2×1-(-2)2-(-5/2)=[(5/2)2]-1/2+2-4+5/2=(5/2)-1+2-4+5/2=2/5-2+5/2=9/10.
[6(1/4)]-1/2+2(√3-√5)0-(-1/2)-2-(-2/5)-1;
原式=(25/4)-1/2+2×1-(-2)2-(-5/2)=[(5/2)2]-1/2+2-4+5/2=(5/2)-1+2-4+5/2=2/5-2+5/2=9/10.