1/4+1/28+1/70+.+1/8554=?

来源：学生作业帮编辑：搜狗做题网作业帮分类：数学作业时间：2024/05/22 05:25:08

1/4+1/28+1/70+.+1/8554
=1/(1*4)+1/(4*7)+1/(7*10)+...+1/(91*94)
=(1/3)*[3/(1*4)+3/(4*7)+3/(7*10)+...+3/(91*94)]
=(1/3)*[(1-1/4)+(1/4-1/7)+(1/7-1/10)+...+(1/91-1/94)]
=(1/3)*[1-1/94]
=31/94

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 1/4+1/28+1/70+.+1/9700 要找规律,今晚8:30之前! 数学题“1/4+1/28+1/70+1/130”怎样计算?