4.Tentukan hasil dari:
Jawaban:
a.1/3 + 27/25 : 9/5 = 1/3 + 273/255 x 5/9 = 1/3 + 3/5 = 5/15 + 9/15 = 14/15
b.2 2/3 x (1 ½ + 4/5) = 8/3 x (3/2 + 4/5) = 8/3 x (15/10 + 8/10) = 84/3 x 23/105 = 92/15 = 6 2/15
c.1/2 x 1 1/3 + 2/9 : 10/6 = (½ x 4/3) + (2/93 x 62/105) = 4/6 + 2/15 = 20/30 + 4/30 = 24/30 = 4/5
d.1 2/3 : 2 ½ - 3/5 x 1 2/7 = (5/3 x 2/5) – (3/5 x 9/7) = 2/3 – 27/35 = 70/105 – 81/105 = - 11/105
5.Harga suatu barang, naik 20%. Jika harga sebelum kenaikan adalah Rp8.000,00, maka harga setelah kenaikan adalah ...