(72.5-3.44-6.56)×(9-4)
=(69.06-6.56)×(9-4)
=62.5×5
=312.5
1999×99+1999
=1999×(99+1)
=1999×100
=199900
40.8-6.18÷0.6×2.4
=40.8-10.3×2.4
=40.8-24.72
=16.08
(72.5-3.44-6.56)×(9-4)
=(69.06-6.56)×(9-4)
=62.5×5
=312.5
1999×99+1999
=1999×(99+1)
=1999×100
=199900
40.8-6.18÷0.6×2.4
=40.8-10.3×2.4
=40.8-24.72
=16.08
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