6.25÷1%-1.25×25×8
=625-（1.25×8）×25
=625-10×25
=625-250
=375
3/5×81+60%×19
=0.6×（81+19）
=0.6×100
=60
4/3×4÷4×4/3
=4/3×4/3×（4÷4)
=4/3×4/3
=16/9
13/7×12.5%+12.5%×13/6
=（13/7+13/6）×12.5%
=1×12.5%
=0.125
5/4×3.5+5.5×80%+0.8
=0.8×（3.5+5.5+1）
=0.8×10
=8
（27+19/18）÷9
=27÷9+19/18÷9
=3+19/2
=3又19/2
81/5×3.6÷1又6/1
=9/2÷7/6
=9/2×6/7
=27/7