November 2018 1 90 Report
Completa el termino que falta de las siguientes igualdades
(-4)+( ) = (-28) (-4)+( ) = (+12) ( ) + (+4) = (-15)

( ) + (+9) = (+7) ( ) - (-15) =(-2) ( ) - (+13) = (+27)

(-18) - ( ) = (+3) (+15) - ( ) = (-8) ( ) ˣ (-9) = (-27)

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