Correcto: 2X, 2 . 2=4, 2 . 5 =10, 2. 2=4, 2.Y, 2A, 2 .8=16, 2 . 4=8, 2.150=300, 2. d, Incorrecto: 2X2, 2 . 3=7, 2+2= 5, 3 . 3=9, 2Y3, A + B, 2.8=10, 10 -2=8, 2 +2.3=8, a+a,

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