Tolong ya besok di kumpulkan

1. 2 1/4 + 1 4/5 - 1 2/3
Kalo soalnya pecahan camuran, cara kerjainnya ubah semua ke pecahan biasa
Cara ubah pecahan campuran ke pecahan biasa a b/c = cxa+b

Jadi 2 1/4 + 1 4/5 - 1 2/3
= 9/4 + 9/5 - 5/3
Terus samain deh penyebutnya jadi 60
= 135/60 + 108/60 - 100/60
= 343/60
= 5 43/60

[ 1] 2 1/4 + 1 4/5 = 9/8 + 9/5 = 18/40 - 1 2/5 = 18/40 - 7/40 = 11/40
[ 2 ] 0,5 + 7,5 = 8,0 - 1,2 = 6,8 kg
[ 3 ] 3/4 + 1 2/5 = 3/4 + 7/5 = 10/20 - 9/10 = 10/20 - 9/20 = 1/20
[ 4 ] 5/6 - 2/5 + 1 1/7 = 5/6 - 2/5 + 8/7 = 5/210 - 2/210 + 8/210 = 11/210