Vero: 1000-10= 990, 2000-200=1800, 810+400=1210, 1000+2250=3250, 170-123=293, 700+350=1050, 1700+230=1930, , Falso: 1200+20=1500, 1800-200=1400, 800 +430=1200, 2000-100=1999, 1400+1500=3000, 750-550=20, 1100-100=900,

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