Question

7/9×25/23-7/23×2/9的简便算法是？

Answer 1

7/9×25/23-7/23×2/9的简便算法是
应用乘法分配律：
7/9×25/23-7/23×2/9
=7/9×25/23-2/23×7/9
=7/9×（25/23-2/23）
=7/9×1
=7/9
或者
7/9×25/23-7/23×2/9
=25/9×7/23-7/23×2/9
=（25/9-2/9）×7/23
=23/9×7/23
=7/9

Answer 2

根据题意可知:
7/9×25/23－7/23×2/9
＝(7×25)/(9×23)－(7×2)/(9×23)
＝7/23×25/9－7/23×2/9
＝7/23×(25/9－2/9)
＝7/23×23/9
＝7/9

Answer 3

解:7/9×25/23-7/23×2/9=7/9×25/23-7/9×2/23=
7/9×(25/23-2/23)=7/9×23/23=7/9×1=7/9，希望可以帮到你

Answer 4

解:7/9×25/23-7/23×2/9=7/9×25/23-7/9×2/23=
7/9×(25/23-2/23)=7/9×23/23=7/9×1=7/9，个人认为这道题这样做。

Answer 5

解: 根据题意:7/23 (25/9-2/9)
=7/23X23/9
=7/9≈0.78
所以上式简便运算结果约为0.78