7/30 + 3/20 - 4 1/4 TOLONG dijawab beserta caranya

Jawab:
_______

7/30 + 3/20 - 4 1/4

7/30 + 3/20 - 17/4

7x2/30x2 + 3x3/20x3 - 17x15/4x15

14/60 + 9/60 - 255/60

14+9-255 / 60

- 232/60

= - 58/15 dlm pecahan biasa

= - 3 13/15 dlm pecahan campuran

= -3,87 dlm pecahan desimal

*Terima kasih*

cari kpk 30, 20 dan 4 yaitu 60. tau darimana dapat 60 yaitu :
30 = 2 x 3 x 5
20 = 2 x 2 x 5
4 = 2 x 2
maka kpknya : 2 x 2 x 3 x 5 = 60

7/30 + 3/20 - 4 1/4 = 7/30 + 3/20 - 15/4 = 14/60 + 9/60 - 255/60 = -232/60 = - 3  52/60 = -3  13/15