28×730+73×720
24×56+48×22
36×98+72
999×778+ 333×666
20×80= 0÷79= 1-0.35= 0.6+2.4=
125×4= 420÷4= 5.3-3= 7.2+0.42=
1-0.92= - = ×3.2= ÷ ×5=
3.5+4.28= × = ÷ = 99×0.9+0.9=