(1)
(4/5 -2/3)*250%
=(4/5 -2/3)*5/2
=4/5 *5/2 -2/3 *5/2
=2- 5/3
=6/3 -5/3
=1/5
(2)
2/(4/25)/(5/12)
=2*5/12/(4/25)
=5/6 *25/4
=125/24
(3)
7/8 -(0.5-25%)/(7/16)
=7/8 -1/4 /(7/16)
=7/8- 1/4 *16/7
=7/8 -4/7
=49/56 -32/56
=17/56
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