5减10分之1乘2分之3除8分之3 6除5分之3减6分之5乘0.3 5分之4乘3分之2加3分之1除4分之5 用递等式计算

5-1/10*3/2*8/3
=5-8/45
=4又37/45
6*5/3-5/6*0.3
=10-0.25
=9.75
4/5*2/3+1/3*4/5
=8/15+4/15
=12/15
=4/5