2.400x30=
450x600=
80x926=
200x75=
190x300+929x40=
720x100-28.142:2=

2400 х600 = 1 440 000450 х 600 = 270 00080 х 926 = 74 080200 х 75  = 15 000190 х 300 =57 000       929х 40 = 37160      57 000 + 37 160 = 94 160720 х 100 = 72 000      28.142\2 =14.071     72 000 - 14.071  = 71 985. 929