nomor 1) 4/5 X 2 1/2 : 2/5 buat jalannya nomor 2) 7 3/4 + 1 1/4 X 25 buat jalannya

1. 4/5 × 2½ : 2/5
= 4/5 × 5/2 : 2/5
= 20/10 : 2/5
= 2/1 × 5/2
= 5

2. 7¾ + 1¼ × 25
= 31/4 + 5/4 × 25
= 31/4 + 125/4
= 156/4
= 39

1) 4/5 x 2 1/2 :2/5 = 4/5 x 5/2 x 5/2 = 10/2 = 5/1 alias 5

2)7 3/4 + 1 1/4 x 25 = 31/4 + 5/4 x 25/1 = 31/4 + 125/4 = 156/4 = 412

Good luck