simplifique as frações algébricas

a)12ײy
8×

b)12m
6a

c)8×
10ײ

d)4׳
10×y

e)6a⁵
7a³×

f)8ay
2×y

g)-14׳c⁴
2×c

h)3a-3b
12

i)2×+4y
2a

j)3a+3b
6a+Gb

k)(18×-18)
15×-15

L)ײ-4
×-2

m)a²-9
5a+15
​