-3又1/4+(6又2/3)+(+2又2/3)+3又1/4
=-3又1/4+3又1/4+(6+2/3)+(2+2/3)
=8+4/3
=9又1/3
(-3又1/4)+(+3又2/3)+(+2又1/4)+(-1又2/3)
=-3又1/4+2又1/4+3又2/3 -1又2/3
=-1+2
=1
(-3)-(-2又2/5)
=-3+2又2/5
=-3/5
(-1)-[-2-(-4)-|-1/2|-(-1/3)]
=1-[-2+4-1/2+1/3]
=1-[2-1/6]
=1-2+1/6
=-1+1/6
=-5/6
用简便方法:
0.125+(+3又1/4)+(-3又1/8)+(+7/8)+(-0.25)
=1/8+3又1/4-3又1/8+7/8-1/4
=1/8-3又1/8+7/8+3又1/4-1/4
=-3+7/8+3
=7/8
(+3/17)+(3.36)+[(+7.36)+(+14/17)]
=3/17+3.36+[7.36+14/17]
=3/17+3.36+7.36+14/17
=1+10.72
=11.72
(-3/4)+(+3又3/8)+(+0.75)+(-4又1/2)+(+1又5/8)
=-3/4+3又3/8+3/4-4又1/2+1又5/8
=-3/4+3/4-4又1/2+3又3/8+1又5/8
=-4又1/2+5
=1/2
(+1)+(-2)+(+3)+(-4)+••••••+(+99)+(-100)
=(1-2)+(3-4)+••••••+(99-100)
=(-1)*50
=-50