resolva as operações com numeros racionais
a) 9/4-1/6=
b) 12/5-3/4 + 1/10=
c)1/2+3/2+5/2 - 7/2=
d)+5/9-1/2+4/6=
e)12/9-15/9-5/9=
f)-3/8+1/10+3/4-7/20

eu queria saber a resolução tbm ​