2354×2953=(2650-296)×(2650+303)=2650^2+(303-296)×2650-(300-4)(300+3)=(2700-50)^2+7×2650-300^2+300+12=2700^2-270000+2500+18550-90000+300+12=7290000-270000-90000+20000-1450+2500+312=6950000+1000+362...