1—5分之3×6分之5+3分之1
=1-1/2+1/3
=1-3/6+2/6
=5/6
8又3分之2×5分之2+0.4×6分之1
=8又2/3x2/5+1/6x2/5
=(8又2/3+1/6)x2/5
=8又5/6x2/5
=53/6x2/5
=53/15那9分7×2分1÷5分之7，呢4又5分3—1又3分之2+5分之2呢。？