19又18/19×5
=(20-1/19)×5
=20×5-1/19×5
=100-5/19
=99又14/19【(+3/5)+(-1/2)+(-5/12)】*60(-8)*(-12)*(0.125)*(-1/3)*(-1/5)(-11)*(-2/5)+(-11)*(+2又五分之三)+(-11)*(1/5)[3/5+(-1/2)+(-5/12)]×60=(3/5-1/2-5/12)×60=3/5×60-1/2×60-5/12×60=36-30-25=-19(-8)×(-12)×(0.125)×(-1/3)×(-1/5)=8×3×4×1/8×1/3×1/5=4×1/5=4/5(-11)×(-2/5)+(-11)×(2又3/5)+(-11)×(1/5)=(-11)×(-2/5+2又3/5+1/5)=-11×(2又1/5)=-24又1/5