Sagot :
1\5-(-1/15+5/25)+2/3
=1/5-(-1/15+1/5)+2/3
=1/5-(-1/15+3/15)+2/3
=1/5-2/15+2/3
=3/15-2/15+10/15
=11/15
=1/5-(-1/15+1/5)+2/3
=1/5-(-1/15+3/15)+2/3
=1/5-2/15+2/3
=3/15-2/15+10/15
=11/15