Ответ:
А+В=5х+7у+2х-3у=5х+2х=7х 7у-3у=4у=7х+4у=11х
А-В=5х+7у-2х-3у=5х-2х=3х 7у-3у=4у=3х-4у=9х
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Ответ:
А+В=5х+7у+2х-3у=5х+2х=7х 7у-3у=4у=7х+4у=11х
А-В=5х+7у-2х-3у=5х-2х=3х 7у-3у=4у=3х-4у=9х