(990-90):100*9. 990-40.+25*7*4
900-90=900 900:100=9 9*9=81 990-40=950 25*7=175 175*4=700 950+700=1650
(990-90):100*9990-40+25*7*4=89210
(990-90):100*9равно81 990-40.+25*7*4равно1650