Verdadeiro: 7x9=63, 15+39=54, 1800:600=3, 842-35=807, 513-392=121, 4x15 ≥ 6x9+6, Falso: 59∶6=9, 64+46=100, 88+22 ≤ 10x10, 100-36=44, 649-455=244, 5x14 ≤ 10x5+2,

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