1/4+1/28+1/70+.+1/9700=?

来源：学生作业帮编辑：搜搜考试网作业帮分类：数学作业时间：2024/07/20 15:02:10

1/4+1/28+1/70+.+1/9700
=1/(1*4)+1/(4*7)+1/(7*10)+...+1/(97*100)
=(1/3)[(1/1)-(1/4)]+(1/3)[(1/4)-(1/7)]+(1/3)[(1/7)-(1/10)]+...+(1/3)[(1/97)-(1/100)]
=(1/3)[1-(1/4)+(1/4)-(1/7)+(1/7)-(1/10)+...+(1/97)-(1/100)]
=(1/3)[1-(1/100)]
=(1/3)*(99/100)
=33/100.

1/4+1/28+1/70+.+1/9700 要找规律,今晚8:30之前! 1/4+1/28+1/70+…1/89698=? 1/4+1/28+1/70+1/130=? 4/1+28/1+70/1+130/1+208/1=?简算 4\1+28\1+70\1+130\1+208\1=多少.简算,有说明 1/4+1/28+1/70+1/130+1/208= 1/4+1/28+1/70+1/130简算 1/4+1/28+1/70+1/130 4分之1+28分之1+70分之1+130分之1=多少? 1|4+1|28+1|70+1|130+1|208+1|304 计算,1x1/3-7/12+9/20-11/30+13/40-15/56=?,1/4+1/28+1/70+1/130+1 数学题“1/4+1/28+1/70+1/130”怎样计算?