tolong dong besok di kumpul

1.8 : 4/5
=8/1 :4/5
=8/1×5/4
=40/4
=10/1
=10

2.10:3,1/5
=10/1 : 16/5
=10/1 : 5/16
=50/16
=25/8

3.3/5 :16/21
=3/5 × 21/16
=63/80

4.8/9 : 18/30
=8/9 × 30/18
=240/162
=120/81
=1,39/81

5.2/5 : 4
=2/5 ×1/4
=2/20
=1/10