1)（-2又3/7)+(3又1/3）+（-1又4/7)
=-2-3/7+3+1/3-1-4/7
=-2+3-1-3/7-4/7+1/3
=-(3/7+4/7)+1/3
=-1+1/3
=-2/3
2)（0-3又2/11)+(-6)-(+5又3/11)
=-3-2/11-6+5+3/11
=-3-6+5-2/11+3/11
=-4+1/11
=-3-10/11
=-3又10/11
3) 1/2+(-2/3)+(-4/5)+(-11)
=1/2-2/3-4/5-11
=(15-20-24)/30-11
=29/30-11
=-10-1/30
=-10又1/30
4) (+4.4)-(-0.1)-(-3又1/2)
=4.4+0.1+3.5
=8
5) 6.1-(-3.7)-(+4.9)-(-9.8)
=6.1+3.7-4.9+9.8
=6.1+9.8+3.7-4.9
=15.9-4.9+3.7
=11+3.7
=14.7
6) (-2又3/7）+（-3又1/6）+（1又4/7)
=-2-3/7-3-1/6+1+4/7
=-2-3+1-3/7-1/6+4/7
=-4+4/7-3/7-1/6
=-4+1/7-1/6
=-4-1/42
=-4又1/42