Question

900/80,940/60,700/60,870/40.用简便计算

Answer 1

900/80=800/80+80/80+20/80=10+1+0.25=11.25

940/60=600/60+300/60+40/60=10+5+2/3=47/3

700/60=600/60+60/60+40/60=10+1+2/3=35/3

870/40=800/40+80/40-10/40=20+2-0.25=21.75