1.45+38×5-11 2.175÷25×9+300 3.15.000-225×8+415 4.(5×135)-(7.200÷24) 5.320.275+(14.229÷31)

1. 45 + 38 × 5 - 11
= 45 + (38 × 5 ) - 11
= 45 + 190 - 11
= 235 - 11
= 224

2. 175 ÷ 25 ×9 × 300
= (175 ÷ 25) × (9 × 300)
= 7 × 2.700
= 18.900

3. 15.000 - 225 × 8 + 415
= 15.000 - ( 225 × 8 ) + 415
= 15.000 - 1.800 + 415
= 13.200 + 415
= 13.615

4. (5 × 135) - ( 7200 ÷ 24 )
= 675 - 300
=375

5. 320.725 + ( 14.229 ÷ 31 )
= 320.725 + 459
=321.184