Question

这题初中数学题目怎么做 谢谢各位

这题初中数学题目怎么做 谢谢各位求写出过程

Answer 1

x/(1x3) = (1/2) x X x(1-1/3)
x/(3x5) = (1/2) x X x(1/3-1/5)
之后以此类推可消
望采纳

Answer 2

x/2*(1-1/3+1/3-1/5+1/5-1/7+……+1/2013-1/2015)＝2014
x/2*(1-1/2015)＝2014
x/2*2014/2015＝2014
x＝4030

Answer 3

1/(1*3)=(1/2)(1-(1/3))
1/(3*5)=(1/2)((1/3)-(1/5))
1/(5*7)=(1/2)((1/5)-(1/7))
……
1/(2013*2015)=(1/2)((1/2013)-(1/2015))
原式=(1/2)[x-(x/2015)]=2014
x=4030