mdsk.net
当前位置:首页 >> 43.4%(23.4.7)简便 >>

43.4%(23.4.7)简便

43.4-(23.4-14.7) =43.4-23.4+14.7 =20+14.7 =34.7

23×54+34×54-57×44 =(23+34)×54-57×44 =57×54-57×44 =57×(54-44) =57×10 =570 65×43+35×67+24×15 =5×(13×43)+5×(7×67)+(24×3)×5 =5×559+5×469+72×5 =5×(559+469+72) =5×1100 =5500

43 3+(1)=4;4+(3)=7,7+(9)=16 1:3:9 成等比 ,所以是二级等比数列 16+(27)=43

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