1原式=1/2002-1/2003-1/2002+1/2004+1/2003-1/2004
=0
2原式=-11/3+11/4+5/3-7/4
=-2+1
=-1
3原式=3.71-1.71+5
=7
4原式=-81+71+81+2
=73
那个人有两题错了
1原式=1/2002-1/2003-1/2002+1/2004+1/2003-1/2004
=0
2原式=-11/3+11/4+5/3-7/4
=-2+1
=-1
3原式=3.71-1.71+5
=7
4原式=-81+71+81+2
=73
那个人有两题错了