Correcto: 10 x 10, 90 + 10, 50 + 50, 50 x 2, 80 + 20, 40 + 60, 150 - 50, 200 : 2, 15 + 85, 45 + 45, Incorrecto: 50 + 40, 60+20, 100 - 20, 300 : 2 , 40 x 2,

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