999.9×999.9+199.99
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999.9×999.9+199.99
![999.9×999.9+199.99](/uploads/image/z/17602505-17-5.jpg?t=999.9%C3%97999.9%2B199.99)
999.9×999.9+199.99
=999.9×(1000-0.1)+199.99
=999.9×1000-999.9×0.1+199.99
=999900-99.99+199.99
=999900+100
=1000000
=999.9×(1000-0.1)+199.99
=999.9×1000-999.9×0.1+199.99
=999900-99.99+199.99
=999900+100
=1000000