www.fltk.net > 5/9%5/16X7/9简便计算

5/9%5/16X7/9简便计算

5/9-5/16×7/9 = 5/9-5/9×7/16 =5/9×(1-7/16) =5/9×9/16 =5/16 这道题目的关键是把5/16和7/9的分母交换,于是就又得到5/9这个数啦~

提取公因数5/7 原式=5/7×(1-5/9) =5/7×4/9 =20/63

(9/10)x56-(9/10)x44 =(9/10)(56-44) =(9/10)x12 =54/5 (4/25)x99 =(4/25)x(100-1) =16-(4/25) =15又9/25 (5/8 + 3/7)x8x7 =5x7+3x8 =59

5X999十5十99X7十7十3X9十3十9 =5x(999+1)+7x(99+1)+3x(9+1)+9 =5x1000+7x100+3x10+9 =5000+700+30+9 =5739

分别提取5.7.3

5/1x6/1+6/1x7/1+7/1x8/1+8/1x9/1+9/1x10/1 =5X6+6X7+7X8+8X9+9X10 =6X12+7X8+9X18 =6X(12+27)+7X8 =6X39+7X8 =234+56 =290

for循环的为什么要用do…while?

原式=5×(99+1)+7×(99+1)+3×(9+1)=500+700+30=1230

分数乘法,任务就是约分, 约分后,得到11/112。

8.9x7.8+5.2x7.8+7.8 =(8.9+5.2+1)x7.8 =15.1x7.8 =117.78

网站地图

All rights reserved Powered by www.fltk.net

copyright ©right 2010-2021。
www.fltk.net内容来自网络,如有侵犯请联系客服。zhit325@qq.com