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200a+300ab-400ab-600b
200a²-100ab-600b²
Esepro que sirva!Saludos!
Multiplicamos :
100a (2a) + 100a (3b) - 200b (2a) - 200b (3b)
200a² + 300ab - 400ab - 600b²
200a² - 100ab - 600b²
Solución :
200a² - 100ab - 600b²