2 câu trả lời
a) x2−2x2+x−xy2=−x2+x−xy2=x(−x+1−y2)
b) 7x2−12x+5=7x2−7x−5x+5=7x(x−1)−5(x−1)=(7x−5)(x−1).
a)x2−2x2+x−xy2=−x2+x−xy2=−x(x+y2−1).⇒Xemlaidebai.b)7x2−12x+5=7x2−7x−5x+5=7x(x−1)−5(x−1)=(x−1)(7x−5).
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