(2/17-4/13)-(2/17-3/7)-|9/13-4/7|=?

问题描述:

(2/17-4/13)-(2/17-3/7)-|9/13-4/7|=?
等于多少哦?

=2/17-4/13-2/17+3/7-(9/13-4/7)
=-4/13+3/7-9/13+4/7
=-(4+9)/13+(3+4)/7
=-1+1
=0