Question

BT:

Câu 1)x2+x+y2-y-2xy

Câu 2)3a+3b-a2-ab 

Câu 3)-x2+7x-6

Answer 1

Đề là J vậy ???

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Answer 2

Đề nâng cao đấy bạn

Answer 3

1.x²-2xy+y²+x-y=(x-y)²+(x-y)=(x-y+1)(x-y)

2.3a+3b-a²-ab=3(a+b)-a(a+b)=(3-a)(a+b)

Answer 4

\(x^2+x+y^2-y-2xy=x^2-2xy+y^2+x-y=\left(x-y\right)^2+x-y\)

\(=\left(x-y\right)\left(x+y+1\right)\)

\(2,3b+3a-a^2-ab=3\left(a+b\right)-a\left(a+b\right)=\left(3-a\right)\left(a+b\right)\)

\(3,-x^2+7x-6=-x^2+1x-6+6x=x\left(1-x\right)-6\left(1-x\right)\)

\(=\left(x-6\right)\left(1-x\right)\)

Answer 5

đề thi hk1