A)4/15 × 75/11=300/165 =20/11=1 9 / 11
Б)9/25 × 5/13 = 45/325 =9/65
в)13/9 × 5/6=65/54=1 11/54
г)4/20 =1/5 * 5/9=5/45=1/9
Д)3/5*4/1=12/5*12/7=144/35=4 4/35
е)2/5*4/3=8/15*12/5=96/75=32/25=1 7/25=1,28
Ж)6*2/3=12/3=4*3/2=12/2=6
З)7/3*3/11=21/33=7/11*9/4=63/44=1 19/44
и)14/15*3/7=42/105=2/5:12=2/60=1/30