ldcf.net
当前位置:首页 >> 7x9x(6/7一1/9)怎么简算? >>

7x9x(6/7一1/9)怎么简算?

5/7÷1/9十5/7-5/7x9 =5/7x9十5/7-5/7x9 =5/7x9-5/7x9十5/7 =5/7x(9-9)十5/7 =5/7

=1/2×(1-1/3+1/3-1/5+1/5-1/7+17-1/9+1/9-1/11) =1/2×(1-1/11) =1/2×10/11 =5/11

分子 =10.5X11.7X57X85=(0.5X3X7)X(0.3X3X13)X(3X19)X(5X17) 分子=1.7X1.9X3X5X7X9X11X13X15=1.7X1.9X3X5X7X(3X3)X11X13X(5X3) 因此原式通分得 原式=1/11

7/5-9/7x9/5 =7/5-9/7x(2/5+7/5) =7/5-9/7x2/5-9/7x7/5 =7/5x(1-9/7)-18/35 =-7/5x2/7-18/35 =-14/35-18/35 =-32/35

原式=7×6/7×1/18+9×6/7×1/18 =1/3+3/7 =16/21

7/5-81/35 =-32/35

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