111. ա) 20x718x50=20x50x718=718000 80x60x50=80x50x60=2400000 30x24x50x20=50x20x30x24=720000 բ) 40x48x25=40x25x48=48000 40x70x50=40x50x70=140000 50x42x40x2=50x2x42x40=1680000 12. 20xax70xb=20xbx70xa=5600000 13. 450×32-526+(9324-872):2=13774 4500:3x(275:5)=82500