Question

12.875-5又5/7 7/8的简便方法是什么？

Answer 1

简便计算12.875-5又5/7-7/8
解题思路：不能进行简便运算的按顺序计算，简便运算核心是运用加法和乘法各种定律进行计算，计算出整数部分方便后续计算的过程
解题过程：

12.875-5又5/7-7/8

=12又7/8-7/8-5又5/7

=12-5又5/7

=6又2/7

存疑请追问，满意请采纳

Answer 2

12.875-5又5/7+7/8
=12又7/8+7/8-5又5/7
=13又3/4-5又5/7
=8又1/28

Answer 3

12.875-5又5/7+7/8
=（12+7/8）+7/8-5又5/7
=12+7/8+7/8-5-5/7
=12+14/8-5-5/7
=12+1又3/4-5-5/7
=12+1-5+3/4-5/7
=8+（21/28-20/21)
=8+1/21
=8又1/21

Answer 4

12.875-5又5/7-7/8
=12.875-0.875-5又5/7
=12-5又5/7
=6又2/7

Answer 5

12.875-5又5/7-7/8
＝12.875-5-5/7-0.875
＝（12.875-5-0.875）-5/7
＝7-5/7
＝49/7-5/7
＝44/7