12—2/7+1/7除以1/5 13/25乘6/7+12/25除以7/6 1/

问题描述:

12—2/7+1/7除以1/5 13/25乘6/7+12/25除以7/6 1/
12—2/7+1/7除以1/5 13/25乘6/7+12/25除以7/6
1/13+12/13乘(5/2—1/3)

1 =84/7-2/7+1/7×5
=83/7×5
=415/7
2 =13/25×6/7+12/25×6/7
=(13/25+12/25)6/7
=1×6/7
=6/7
3 =1×(5/2-1/3)
=5/2-1/3
=15/6-2/6
=13/6