2/5+2 1/2+3 1/4=? Satu lagi ya tolong pliss besok dikumpul 2/15-1/2+3/10=?

2/5 +2½ + 3¼
=2/5 + 5/2 + 13/4
=8/20 + 50/20 + 65/20
=123/20
=6 3/20

no 2)
2/15 - 1/2 +3/10
=4/30 - 15/30 + 9/30
= - 2/30
= - 1/15