5又1/5-【2又1/6+(-4.8)-(-4又5/6)】
=5+1/5-[2+1/6-4.8+4+5/6]
=5+1/5-[2+4+1/6+5/6-4.8]
=5+1/5-(6+1-4.8)
=5+1/5-7+4.8
=5-7+1/5+4.8
=-2+5
=3
5又1/5-【2又1/6+(-4.8)-(-4又5/6)】
=5+1/5-[2+1/6-4.8+4+5/6]
=5+1/5-[2+4+1/6+5/6-4.8]
=5+1/5-(6+1-4.8)
=5+1/5-7+4.8
=5-7+1/5+4.8
=-2+5
=3