tolong bantu jawab matematika

1/5 : ( ½ - 1/10)
= 1/5 : ( 5/10 - 1/10)
= 1/5 : 4/10
=1/5 × 10/4
=10/20
=½

1/5:(10/20-2/20)
=1/5x20/2
=20/10

Maaf jika salah