tolong bantu jawab:v

1.2/7:4/5=2/7×5/4
=10/28=5/14
2.10/9:1.2/3=10/9÷5/3
=10/9×3/5=30/45
=2/3
3.2/25÷6/10÷5/9=2/25×10/6
=20/150×9/5
=180/750=6/25
4.1.1/2÷2.2/3÷3.3/4=3/2÷8/3÷15/4
=3/2×3/8
=9/16×4/15
=36/240=3/20