1/2+1/3+1/4=?
来源:学生作业帮助网 编辑:作业帮 时间:2024/10/23 21:39:40
1/2+1/3+1/4=?
1/2+1/3+1/4=?
1/2+1/3+1/4=?
13/12
11/12
13/12
13/12
先通分,2.3.4最小公倍数是12换成6/12+4/12+3/12=13/12
1/2+1/3+1/4=?
1/2-3/1-4/1=
(1-1/2)*(1-1/3)*(1-1/4)*...*(1-1/99)*(1-1/100)=
1+(1/1+2)+(1/1+2+3)+(1/1+2+3+4)+(1/1+2+3+4+...+100)=?
(1-1/2)+(1/2-1/3)+(1/3-1/4)+.+(1/1999-1/2000)=
巧算:(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)=====
1/1*2+1/2*3+1/3*4+...+1/2000*1/2001=1/1*2+1/2*3+1/3*4+...+1/2000*1/20001=
(1+1/2)*(1-1/2)*(1+1/3)*(1-1/3)*(1+1/4)*(1-1/4)*(1+1/5)*(1-1/5)=?
1/(1+2)+1/(1+2+3)+1/(1+2+3+4)+.+1/(1+2+3+4+.99)=
1/1*2+1/2*3+1/3*4+1/4*5+.+1/39*40=?
1/1*2+1/2*3+1/3*4+1/4*5+.+1/2004*2005=?
1/1*2+1/2*3+1/3*4+1/4*5+^+1/199*200=?
1+2+3-4-5+1+1+2+3=
1+2+3+4=
1+2+3+4=
1+2+3+4=?
-4/3×1/2=
-1+2-3+4=