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2 - 5/2 × (2/4 + 5/8)
2 - 5/2 (1/2 + 5/8)
2 - 5/2 × (4 + 5 / 8)
2 - (5(4 + 5) / 2 × 8)
2 - (5 × 9 / 16)
2 - (45/16)
32 - 45 / 16
-13 / 16
= 0.8125
3 × (2/4 - 3/5)
3 (1/2 - 3/5 )
3 (5 - 6 / 10)
3(5 - 6) / 10
3 × (-1) / 10
-3/10
= -0.3
- Saludos, mucha suerte..