小学六年级的数学题！！谁会做！！！赶紧的！！戳进来！！！

Question

42，44，45题啊！！！！！

Answer 1

42、1/2+3/4+7/8+15/16+31/32+63/64+127/128+255/256
=（1-1/2)+(1-1/4)+(1-1/8)+(1-1/16)+(1-1/32)+(1-1/64)+(1-1/128)+(1-1/256)
=1*8-(1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256)
=8-(1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/256+1/256)+1/256
=8-(1/2+1/4+1/8+1/16+1/32+1/64+1/128+1/128)+1/256
=8-(1/2+1/4+1/8+1/16+1/32+1/64+1/64)+1/256
=8-(1/2+1/4+1/8+1/16+1/32+1/32)+1/256
=8-(1/2+1/4+1/8+1/16+1/16)+1/256
=8-(1/2+1/4+1/8+1/8)+1/256
=8-(1/2+1/4+1/4)+1/256
=8-(1/2+1/2)+1/256
=8-1+1/256
=7+1/256
44、设1+1/2012+1/2013+1/2014=a
则（a-1/2014)(a-1)-a(a-1-1/2014)
=a^2-1/2014a-a+1/2014-a^2+a+1/2014a
=1/2014
45、103-101+99-97+95-93+......+11-9+7-5
=(103-101)+(99-97)+(95-93)+......+(11-9)+(7-5)
=2×25
=50

Answer 2

42，原式=1-1/2+1-1/4+1-1/8+1- ......1./256
=8-﹙1/2+1/4+1/8+....+1/256﹚
=8-255/256=7+1/256
44，令1/2012+1/2013=a，1/2012+1/2013+1/2014=b
原式=﹙1+a﹚b-a﹙1+b﹚=b+ab-ab-a=b-a=1/2014

45，从103到5一共有103-5/2﹚+1=50个奇数，为25个得数是2的减法的和=2*50=100
所以原式=2*25=50

Answer 3

我草这...........我也是6年级滴 ！！！！
可这么............的题都有 我怎么没做过？？？？
大神我其实一题都不会 (*^__^*) 嘻嘻╮(╯▽╰)╭

对不起啊 我不会哦 望采纳

Answer 4

如果可以请给好评哦！！

Answer 5

大小姐啊！你连要求都没说，我哪儿知道怎么做啊！