解析:原式=-+(3-3)--(54)=2+3-5=0.
答案:0
6.计算:
(1) -0+0.25×-4;
(2)-+(0.002)--10(-2)-1+(-)0.
解:(1)原式=-4-1+×()4=-3.
(2)原式=-+--+1
=+500-10(+2)+1
=+10-10-20+1=-.