Sprowadź do najprostszej postaci wyrażenie: (3a+b)(a-b)-2a(a+b)+5ab= ?
3a² - 3ab +ab - b² -2a² - 2ab + 5ab = a² - ab - b²
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3a² - 3ab +ab - b² -2a² - 2ab + 5ab = a² - ab - b²