0.5×87.5%÷12.5%
=1/2×7/8÷1/8
=7/16÷1/8
=7/16×8
=7/2
简算依据:0.5=1/2 1/8=0·125 7/8=0·875
(84-24÷2/5)÷120%
=(84-24×5/2)÷6/5
=(84-60)×5/6
=24×5/6
=20
0.5×87.5%÷12.5%
=1/2×7/8÷1/8
=7/16÷1/8
=7/16×8
=7/2
简算依据:0.5=1/2 1/8=0·125 7/8=0·875
(84-24÷2/5)÷120%
=(84-24×5/2)÷6/5
=(84-60)×5/6
=24×5/6
=20