[13*2/2+1/3*(-13)]+(-0.35*2/7-5/7*0.34)

是[-13*2/3+1/3*(-13)]+(-0.35*2/7-5/7*0.35）吧
=(-13)*(2/3+1/3)+(-0.35)*(2/7+5/7)
=-13*1-0.35*1
=-13.35
（-2014又1/6）+（-2014又2/3)+4018又2/3+(-1又1/2)
=-2014-1/6-2014-2/3+4018+2/3-1-1/2
=(-2014-2014+4018-1)-1/6-2/3-1/2
=-11-1/6-4/6-3/6
=-11-8/6
=-33/3-4/3
=-37/3
1又1/4-[1/2*(-12)-1/3*（-12）-1/4*(-12)]
=1+1/4-[-6+4+3]
=1+1/4-1
=1/4
(1/6-3/14+2/3-2/7)*(-42)
=(1/6+4/6-3/14-4/14)*(-42)
=(5/6-7/14)*(-42)
=(5/6-1/2)*(-42)
=(5/6-3/6)*(-42)
=2/6*(-42)
=-14