1*2/1+2*3/1+3*4/1+4*5/1.199*200/1
简便计算:1*2/1+1*3/1+1*4/1+1*5/1.199*200/1
1*2/1+2*3/1+3*4/1+4*5/1.199*200/1
1 2 3 4 5 =200
(1+1/2+1/3+1/4+1/5)*(1/3+1/4+1)-(1+1/3+1/4)*(1/2+1/3+1/4+1/5
1/1*2+1/2+3+1/3*4+1/4*5+……+1/199*200
1-1/2+1/3-1/4+1/5+1/6+1/7-----------+1/199-1/200
/1/3-1/2/+/1/4-1/3/+/1/5-1/4/+.+/1/10-1/9/
简算:(1+1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)×(1/
提问题(1+1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1/2+1/3+1/4)×(1+1/2+1/
-1/2,+1/3,-1/4,+1/5,-1/6,.
200*(1-1/2)*(1-1/3)*(1-1/4)*.*(1-1/100)
200×(1-1/2)×(1-1/3)×(1-1/4)×……×(1-1/100)=?