Question

fill in blank 20+(-13= _____+20​

Answer 1

Answer:

$20 + ( - 13) = \: \: \: \: \: \: + 20 \\ \\ we \: know \: there \: is \: equality \: sign \\ so \: a \: numbe \: should \: be \: added \: \\ such \: that \: sum \: of \: 20 \: and \: - 13 \: \\ will \: be \: equal \: to \: \: the \: result \: \\ so \: ........................................ \\ 20 + ( - 13) = \: ( - 13) + 20 \\ \\ so \: - 13 \: would \: be \: putted \: in \: the \: \\ blank \: space..............$

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