mdsk.net
当前位置:首页 >> 分数的拆分练习题一乘二分之三减二乘三分之五加三... >>

分数的拆分练习题一乘二分之三减二乘三分之五加三...

小学奥数的分数裂项 4/3-8/(3*5)+12/(5*7)-16/(7*9)+……-40/19*21 =1+1/3-1/3-1/5+1/5+1/7-1/7-1/9+……-1/19-1/21 =1-1/21 =20/21

1、(1/2-1/6)×3/5÷1/5 =(3/6-1/6)×3/5×5 =1/3×3 =1 2、5/6+5/3×4/5 =5/6+4/3 =5/6+8/6 =13/6 3、(1/6+3/4-2/3)×12 =(2/12+9/12-8/12)×12 =3/12×12 =3 很高兴可以帮助到你,对本题有什么不明白的请追问,满意请给个 “好评” 吧 O(∩_∩)O谢...

五又五分之二减一点八除以一点一五加二十分之十三的乘以一又三分之二 =5+2/5-18/10÷115/100+13/20*5/3 =5+2/5-18/10*20/23+13/4*1/3 =5+2/5-36/23+13/12 =5+(552-2160/23+1495)/1380 =5-113/1380 =4+1267/1380 =4又1267/1380

结果等于18,咱们分步骤算,你看啊,3-2=1;1+5=6;6+3=9;9x2=18;对不对呀?

-2分之1+6分之1-8分之3+12分之5×(-24分之1) =-24分之12+24分之4-24分之9-288分之5 =-24分之17-288分之5 =-288分之204-288分之5 =-288分之209 结果是-288分之209

1/2-2/9x[(4+1/2)-(3+3/5)+(12+7/20)] =1/2-2/9x(4+1/2-3-3/5+12+7/20) =1/2-2/9x(4-3+12+10/20-12/20+7/20) =1/2-2/9x(13+5/20) =1/2-2/9x13-2/9x1/4 =1/2-26/9-1/18 =9/18-52/18-1/18 =44/18 =22/9 =2又4/9 谢谢,请采纳

分开相乘,再按加减顺序加减即可,

∵列式 = 2/7x5/3+2/7x1/3-2/7 = 2/7(5/3+1/3)-2/7 = 2/7x6/3-2/7 = 2/7x2-2/7 = 2/7x(2-1) = 2/7 ∴依据就是化简成整

网站首页 | 网站地图
All rights reserved Powered by www.mdsk.net
copyright ©right 2010-2021。
内容来自网络,如有侵犯请联系客服。zhit325@qq.com