Doprowadz wyrażenia do najprostrzej postaci: a)-{-[3m-5n)-(-7n-5m)]+(4m+8n-9)} b)25x^2y-[5xy^2-(10xy^2+7x^2y^2)-(3y^2x-11y^2x^x2)]
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21mn -15mKwadrat +35n kwadrat -15mn+28m kw -54mn-27m-20m kw
+40mn+45n= -48+13m kawdrat +35n