伐數分式及公式(請盡快回答)

1f
5x/(20y)
=x/4y

1g
-36xy/(6x)
=-6y

2c
(a/b)*(2b/3a)
=2/3

2d
(a/5)/(a/6)
=6/5

2f
[(m^2)/3n]/(mn/6)
=[(m^2)/3n][6/(mn)]
=2m/(n^2)

2h
(12/p)/(4/p)
=3

2i
(3a^3)/(6b^3)*(6b^2)/(a^3)
=3/b

1
9a/27
=a/3

2
5/(20x^2)
=1/(4x^2)

3
-7y/21y
=-1/3

4
18m/(27m^2)
=2/(3m)

5
2ax^2 y/(8axz)
=xy/(4z)

6
(6x^4)/(4x^4)
=3/2

j
[7x/(2y)]/[(49x)/(10y)]
=7x(10y)/(2y*49x)
=5/7