1. Раскройте скобки в выражении:
а) х + у + (- а + в) = ____________________________
б) х- (у + а) = ____________________________
в) – (х – у –(-а)) + ( -в + с) = __________________________________
г) х – (а –в + у) = ___________________________
д) (а + в) – ( а – в) = _________________________

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