1 dikurangi 2 per 5 dikurangi 3 per 8

1 - 2/5 - 3/8
= (5/5 - 2/5) - 3/8
= 3/5 - 3/8
= 24/40 - 15/40
= 9/40 ✔

1 - 2/5 - 3/8 =
40/40 - 16/40 - 15/40 =
9/40

Kalau boleh jadikan jawaban terbaik yah.