201×9.8-9.8=9.8×(201-1)=9.8×200=1960
201×9.8-9.8=(201-1)x9.8=200x9.8=200x(10-0.2)=200x10-200x0.2=2000-40=1960希望能帮到你!
201×9.8-9.8=(201-1)×(10-0.2)=200×10-200×0.2=2000-40=1960
1960
(201-1)x9.8