5-10分之1×2分之3÷8分之3
=5-1/10x3/2x8/3
=5-1/10x4
=5-0.4
=4.6
6÷5分之3－6分5×0.3
=6x5/3-5/6x3/10
=10-1/4
=9又3/4
5分之4×3分之2+3分之1÷4分之4
=8/15+1/3
=8/15+5/15
=13/15