(5/4-0.8)/0.63-(3/4/0.45-7/5)
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(5/4-0.8)/0.63-(3/4/0.45-7/5)(5/4-0.8)/0.63-(3/4/0.45-7/5)(5/4-0.8)/0.63-(3/4/0.45-7/5)=(1.25-0.8)/0
(5/4-0.8)/0.63-(3/4/0.45-7/5)
(5/4-0.8)/0.63-(3/4/0.45-7/5)
(5/4-0.8)/0.63-(3/4/0.45-7/5)
=(1.25-0.8)/0.63-[(15/20)/(9/20)-7/5]
=(45/100)/(63/100)-(5/3-7/5)
=45/63-(25/15-21/15)
=5/7-4/15
=47/105