tolong yaaa dijawab pake caranyaaa pleaaassss no.9 sampai 11

9. 0.50 + 2.75 = 3.25

10. 7/4 + 65/100 + 12.5/100
= 175/100 + 65/100 + 12.5/100
= 252,5/100
=2.525

11. 12:4 = 2.4
4.04 - 2.40 = 1.64