Question

简算0.01+0.03+0.05+…+0.09++0.11+…0.97+0.99

Answer 1

0.01+0.03+0.05+…+0.09++0.11+…0.97+0.99
=1/100*(1+3+5+...+97+99)
=1/100*(1+99)*50/2
=25

0.01+0.03+0.05+…+0.09++0.11+…0.97+0.99
=(0.01+0.99)+(0.03+0.97)+...+(0.49+0.51)
=1*25
=25

Answer 2

（0.01+0.99）*99/2=49.5 答题不易 望采纳谢谢

追问

1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/512

追答

1-1/2+1/2-1/4+1/4/-1/8+1/8-1/16+1/16-1/32+1/32-1/64+1/64-1/128+1/128-1/256+1/256-1/512=1-1/512=511/512 谢谢 望体谅 求采纳

Answer 3

Answer 4

这是等差数列，公差为2…共有50项…用公式求解(0.01 0.99)/2再×50＝50