-3/4+(-20.125)-6.5+1/8-(-0.75)=0.75-20.125-6.5+0.125-0.75=（0.75-0.75）+（0.125-20.125）-6.5=0-20-6.5=-26.5-5.29+3.1-(-1.8)+(-0.1)-9.87=-5.29+3.1+1.8-0.1-9.87=-10.36