1.4 1/3:2:1 5/6? 2.3/4x(0,72:4/5)-8/20? 3.dalam semangka kandungan airnya 17/20.yang bukan air adalah?

1. 4 1/3 ÷ 2 ÷ 1 5/6
= 13/3 × 1/2 × 11/6
= 143/36
= 3 35/36

2. 3/4 × (0.72 ÷ 4/5) - 8/20
= 3/4 × (72/100 × 5/4) - 8/20
= 3/4 × 360/400 - 2/5
= 3/4 × 2/5 - 2/5
= 6/20 - 8/20
= - 2/20
= - 1/10

3. 20/20 - 17/20
= 3/20