1)
3600-75/8400-175
=48.75-75/48.175-175
=75.(48-1)/175.(48-1)
=75/175
=3/7
2)
Gọi tử là A
Ta có A=530.71-180
A=53.71.10-180
A=(52.71+71).10-180
A=52.71.10+71.10-180
A=52.71.10+10.(71-18)
A=10.(52.71+53)
Ta có 71.52+53 / 530.71-180
= 71.52+53 / 10.(52.71+53)
=1/10