390 ÷ 10 - 39, 1.2 +0.2 - 1.4, 240 para 300 - 60, 250 ÷ 10 - 25, 20 x 10 - 200, 18 x 2 - 36, 100 - 89 - 11, 1.5 - 0.5 - 2.0, 20 x 6 - 120, 298 para 400 - 102,

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