1+2+3+4+5+……+2000+2001=
3个回答
1+2+3+4+...+2001
=(1+2001)*2001/2
=2003001
相关问题
巧算(1/(2/3)/(3/4)/(4/5)/(5/6)/./(1999/2000)/(2000/2001)/(2001
1/2/3+1/3/4+1/4/5+1/5/6+.+1/2000/2001+1/2001/2002=?
1+1/2*3+1/3*4+1/4*5+1/5*6+.+1/2000*2001+1/2001*2002
-1+2-3+4-5+6-7+……+2000-2001=
(1-1/2*2)(1-1/3*3)(1-1/4*4)……(1-1/2000 *2000)(1-1/2001*2001)
1+2+3+4+5.2000+2001+2002+2003+2004=?
2002*2001-2001*2000+2000*1999-.-3*2+2*1
2/1*2*3+2/2*3*4+2/3*4*5+…2/1999*2000*2001
(1+3+5...+1999+2001)-(2+4+6...+1998+2000+2002)
(1+3+5+...+1999+2000+2001)-(2+4+6+...+1998+2002)