Kak kasi tau dong

1. 2 3/20
2. 22/45
semoga membantu

1. 2/5 + 1 3/4
= 2/5 + 7/4
= 8/20 + 35/20
=43/20
= 1 13/20

2.5 1/2 : 4 2/7 : 2 5/8
= 11/2 : 30/7 : 21/8
= 11/2 × 7/30 × 8/21
= 1155/210 × 49/210 ×80/210
= 4527600 / 210
=21560
semoga dapat membantu.:)