(-3又七分之一)+(+5又五分之一)
=(-3+5)+(-1/7+1/5)
=2又2/35
(-1又四分之一)+(+1.25)
=-1.25+1.25
=0
1又三分之一+(-1又二分之一)
=(1-1)+(1/3-1/2)
=-1/6