Пошаговое объяснение:

a) 1 — 15

4/5 — ?

? = 15*(4/5) = (15*4)/5 = (5*3*4)/5 = 3*4 =12

b) 1 — 36

11/12 — ?

? = 36*(11/12) = (36*11)/12 = (12*3*11)/12 =

= 3*11 = 33

c) 1 — 3 7/8

1/5 — ?

? = (3 7/8)*(1/5) = (1/5)*(3*8+7)/8 =

= (1/5) * (31/8)= (31*1)/(5*8) =31/40

d) 1 — 3 1/3

2/7 — ?

? = (2/7)*(3 1/3) = (2/7)*(3*3+1)/3 =

= (2/7)*(10/3) = (2*10)/(7*3)=20/21

e) 1 — 1 4/5

2/3 — ?

? = (2/3)*(1 4/5) = (2/3)*(1*5+4)/5=

= (2/3) * (9/5) = (2*9)/(3*5) = (2*3*3)/(3*5)=

=(2*3)/5= 6/5 = 1 1/5

f) 1 — 3/25

1/6 — ?

? = (1/6)*(3/25) = (1*3)/(6*25) = 3/(2*3*25) =

= 1 / (2*25) = 1/50