Tolong dibantu ya beserta caranya

13. 1,47 + 0,69 x 0,3 (perkalian didahulukan)
= 1,47 + 0.207
= 1.677 (dibulatkan) 1,68

14. 1/4 x 10 +3 1/4
= 5/2 + 13/4
= 5 x 2/2 x 2 + 13/4
= 10/4 + 13/4
= 23/4 atau 5 3/4

15. 45/10 : 5/10 - 5/4
= 9/2 : 1/2 - 5/4
= 9/2 x 2 - 5/4
= 9 - 5/4
= 9 x 4 / 4 - 5/4
= 36/4 - 5/4
= 31/4 atau 7 3/4