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Verified answer
1. 1.800 ÷ (-45) × 35 - 40 × 45(-40) × 35 - 40 × 45
(-1.400) - 1.800
(-3.200)
2. 25 × 90 + 4.500 ÷ (-9) + (-16) × 60
2.250 + (-500) + (-960)
1.750 + (-960)
790