Dau coroana !!! Este foarte urgenttttttt!!!!va rogggg!!!

a) 2/3/4/9=
2/3×9/4=
3/2
h) 1 1/3/16=
4/3×1/16=
1/12
b) 12/3 2/6=
12/20/6=
12×6/20=
18/5