题目内容
4.8-5.3-0.7-8.1
(-0.75)5×(-)3÷(-0.625)
(-2)2003+(-2)2004
(1-x)(1+x)(1+x2)+(1-x2)2
(-a4b2c3)÷(-abc)÷abc2
(-3)-(-4)+(-3)-(+4)
(-)+1-2+3+3.75
×3+÷5
求-(a-1)2的平方根.