tolong semuanya dikerjakan

1. √100 x 8
= 10 √8
= 10 √4 x 2
= 10.2 √2
= 20√2

2. √80
= √4 x 20
= 2 √4 x 5
= 2.2 √5
= 4√5


3. 12√5 - 28√5 + 3√25 x 5
= 12√5 - 28√5 + 15√5
= -√5


4. 3√2 + 6√2 - 4√2 - 5√2
= 0