(-41)+18+(-39)+12,(+0.25)-(-3又8分之1)-(+4分之1)+(-5又8分之3)

问题描述:

(-41)+18+(-39)+12,(+0.25)-(-3又8分之1)-(+4分之1)+(-5又8分之3)
(-18)-(-12)-(+14)+(-9)-(-3),(-0.5)-(-3又4分之1)+2.75-(+7又2分之1)

(-41)+18+(-39)+12=(-41+39)+(18+12)=-80+30=-50(+0.25)-(-3又8分之1)-(+4分之1)+(-5又8分之3)=(0.25-1/4)+(3又1/8-5又3/8)=0-2又1/2=-2又1/4(-18)-(-12)-(+14)+(-9)-(-3)=-6-16-9+3=-22-9...